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Select from the categories below to find answers to some of the most frequently asked questions about Robertshaw products. If you have a question that is not found in the lists below, please contact us at technicalservice@robertshaw.com.
1. Can O16-107 be used in an ammonia system?2. Does Robertshaw have S-45 water valves?3. How to get a N-50 water valve?4. Can you provide some information about the ETC temp probe?5. Is an ETC control able to be calibrated? 6. Is it possible to identify a part by model number of appliance? 7. What are the K Series Temperature Contol Specifications?8. What are replacement options for 4020 series gas oven safeties and FMEA 4030 series safety controls?9. What is the part number for the cover on a 5000-811 thermostat?10. What is the part number for the sensor used on the ERC-2? 11. What is the replacement for mc20-1102?
1. Can O16-107 be used in an ammonia system?
No this control cannot be used in an ammonia system. We do not make any controls that can be used in that type of application. (Back to Top)
2. Does Robertshaw have S-45 water valves?
The S-45 valves are sold as follows: DW-25 120 volt DW-25A 240 volt DW-25B 24 volt They may be purchased through outside distributors. (Back to Top)
3. How to get a N-50 water valve?
Our CW-50 thru CW-56 are all N-50 valves. They may be purchased through outside distributors. (Back to Top)
4. Can you provide some information about the ETC temp probe?
Part number 1309007-044 is the sensor for the ETC. Sensor wire splices should be made external from the control. Additional cable can be spliced to the sensor cable to increase the length beyond the standard 8 feet. It can be extended up to 400 feet. The cable should be at least 22 AWG or larger to keep additional resistance to a minimum. (Back to Top)
5. Is an ETC control able to be calibrated?
The ETC controls cannot be calibrated. If the symbol "CL" appears on the screen it means the controller is going through a self diagnostics. (Back to Top)
6. Is it possible to identify a part by model number of appliance?
In order to track by model number of the appliance you would need to contact a wholesaler as that information is not available to us. If you get a OEM's part number from the wholesaler we can most likely cross reference it from there. Robertshaw has never manufactured complete stoves but has been supplying controls for stoves for 75 years. If there is a particular part you need please look closely on the control itself and there should be a model type of some kind. If all markings have vanished the next step would be to get all the detailed specs of the control and the application. Another option would be to remove the control from the application and walk it in to one of our many wholesalers in your area (found at the link above). If the model number is not legible please provide as much info as possible. Temp range? Mounting type? Capillary length? Bulb size and finish? Stuffing box required? Size?(Back to Top)
7. What are the K Series Temperature Control Specifications?
For a list of specifications of all the K-Series controls, please click here. (Back to Top)
8. What are replacement options for 4020 series gas oven safeties and FMEA 4030 series safety controls?
The 4020 series and 4030 series contain mercury and have been discontinued. The 1720 series can be used as a replacement. The 1720 TS Magnet will also require a 1980 series thermocouple and a pilot assembly (1830 series) compatible for thermocouple use. (Back to Top)
9. What is the part number for the cover on a 5000-811 thermostat?
Use part #40-070 that can be purchased through outside distributors. (Back to Top)
10. What is the part number for the sensor used on the ERC-2?
The sensor part number is 1309007-045. They can be purchased through outside distributors. (Back to Top)
11. What is the replacement for mc20-1102?
Part #3420-104 is the exact replacement. They can be purchased through outside distributors. (Back to Top)
13. What are replacement options for the 4020 series gas oven safeties and the FMEA 4030 series safety controls?14. How do I adjust the bypass on a Robertshaw model BJ Oven Control? 15. What is the difference between a KX and a KXT electric thermostat? 16. What is the part number for the cover on a 5000-811 thermostat?17. What is the required temperature that a thermocouple needs to function?
1. What is the correct ohm reading for the 41-Series Ignitors?
At room temperature the ohm reading should be between 45 TO 90 OHMS. If the reading is over 110 OHMS, the ignitor should be replaced. (Back To Top)
2. Part # 4350-028 appears to be leaking between the front and rear housing. What should I do?
The most likely cause is that the installer rotated the rear housing 180° to fit the application. If the control's rear housing was rotated 180°, the pilot outlet is no longer visible or accessible. Failure to plug the pilot outlet BEFORE rotating will cause what appears to be a leak between the two housings but is simply continuous flow of pilot gas. The pilot outlet should be plugged if it not to be used. If the leak continues, replace the control. (Back to Top)
3. How can I adjust a 5300-360 oven thermostat?
There is not a temperature differential adjustment that can be made to the 5000-360 oven thermostat control. If the differential is as wide as 30°, it might need to be replaced. First make sure the capillary is not sitting anywhere that might be an extreme temp one way or another (like too close to the burner). Next check the sensing bulb to make sure it is properly placed for your application. If it still has a wide differential swing then replace the control. (Back to Top)
4. After replacing the 4350 series BJWA thermostat, there is gas leaking. Why is that?
When the rear housing was rotated, was it rotated 180° or 90°? If it was rotated 180°, was the brass plug inserted into the pilot outlet? If it was rotated 90°, is the pilot outlet being used? If not, it must be plugged. If the gas is not coming from the pilot outlet see if it is coming from the front. What is the incoming gas pressure? A manometer must be used to answer this question accurately but excessive gas pressure is the #1 cause of BJWA's leaking out of the stem. (Back to Top)
5. Can I rotate the rear housing of a Robertshaw BJ series thermostat 180°?
Yes, but some adjustments are necessary. IMPORTANT NOTE #1: The calibration screw in the center of the stem will also require a half turn (180°). IMPORTANT NOTE #2: Plug the pilot outlet before rotating with the brass plug provided. Failure to plug the pilot outlet will cause what appears to be a leak between the two housings but is simply continuous flow of pilot gas. The installation of this device should be done by a qualified technician only with due regard to safety. (Back to Top)
6. Can the magnet head be rotated?
In order to get the existing tubing on the application to reach correct inlet and outlet ports the head would require a 180° turn. That would mean the main outlet of the safety would be on the same side as the pilot inlet of the head, which of course would put the main inlet on the same side as the pilot outlet. The head can be rotated and will function normally. A few OEM's have manufactured equipment with this backwards design over the years. Service companies normally avoid the rotation of the valve head and use new aluminum tubing to reach the correct port for the pilot but the install time can be cut in half by installing a safety with the rotated head. Rotating the head should be performed only by a qualified, licensed technician. (Back to Top)
7. Do you sell the 1720-801 attached to a lower body assembly?
The lower body assembly does not come with part# 1720-801. The components must be purchased separately. (Back to Top)
8. Why is the dual gas valve not lighting and working properly?
If there is still a problem with the main burner where the oven will not come up to temperature, there is a low flame on the bottom burner and it is taking longer than usual to light. The top burner appears to be working fine and the stove burner is working fine. We recommend a couple of things to try. First, have your gas pressure checked. Next, remove the burner and the orifice that feeds the burner and air blow them clean. (Back to Top)
9. How can I locate distributors for Robertshaw products?
To locate a Robertshaw distributor in your area, click on the link below. Enter product categories or part numbers and your zip code for the nearest one.
Robertshaw Distributors (Back to Top)
10. Is it possible to identify a part by model number of appliance?
In order to track by the model number of the appliance, you would need to contact a wholesaler as that information is not available to us. If you get an OEM's part number from the wholesaler, we can then most likely cross reference from there. Robertshaw has never manufactured complete stoves but has been supplying controls for stoves for 75 years. If there is a particular part you need please look closely on the control itself and there should be a model type of some kind. If all markings have vanished the next step would be to get all the detailed specs of the control and the application. Another option would be to remove the control from the application and walk it in to one of our many wholesalers in your area (found at the link above). If the model number is not legible please provide as much info as possible. Temp range? Mounting type? Capillary length? Bulb size and finish? Stuffing box required? Size? (Back to Top)
11. What are the K Series Temperature Control specifications?
For specifications for the Robertshaw K Series temperature controls, click here. (Back to Top)
12. My 41-205 Ignitor is getting red hot but oven will not work. Why is this happening?
Just because the oven ignitor may be glowing doesn't mean it is good. A defective or weak oven ignitor is the most common (85% of the time) cause of gas not flowing to the oven burner. In other instances it is a defective oven gas valve. Over the years we have talked with many qualified service technicians regarding ignitors. We always ask them for their experiences in the field and any conclusions they may have related to these devices. Not one response matches another but the conclusions are close as all refer to certain factors of the numerous applications. These factors (run time, environment, over-cycling, mounting, etc.) play a major role in the life span of the device. Your system may or may not be considering the ideal surroundings required for this ignitor. (Back to Top)
13. What are replacement options for the 4020 series gas oven safeties and the FMEA 4030 series safety controls?
The 4020 series and 4300 series contain mercury and have been discontinued. The 1720 series can be used as a replacement. The 1720 TS Magnet will also require a 1980 series thermocouple and a pilot assembly (1830 series) compatible for thermocouple use. (Back to Top)
14. How do I adjust the bypass on a Robertshaw model BJ Oven Control?
The BJ thermostat is designed with a bypass feature that kicks in when the set-point temp has been reached. The bypass flame should only be 1/8" tall across the length of the burner. To adjust the bypass gas, turn the bypass gas off (by turning screw on the right clockwise), turn the dial to 300°F, and wait for the appliance to reach this temperature. When the gas goes out, turn the thermostat down to 250°F and slowly open the bypass screw (counter clockwise) until the flame on the burner ignites and the flame is 1/8" high across the length of the burner. If adjusting does not solve the problem then replacement kits are available. (Back to Top)
15. What is the difference between a KX and a KXT electric thermostat?
The suffix "T" on the KXT model is used for thermostats that can withstand higher operational temperature levels. The KXT thermostat is rated for an ambient temperature 225°F while the KX thermostat is rated for an ambient temperature of 200°F. (Back to Top)
16. What is the part number for the cover on a 5000-811 thermostat?
17. What is the required temperature that a thermocouple needs to function?
There needs to be a difference of 400°F between the hot and cold junction of the thermocouple for it to function properly. (Back to Top)
Heating - General1. What is the correct OHM reading for the 41- Series Ignitors?2. Can a NL Ignitor replace a PL Ignitor? 3. Can a magnet head be rotated?4. How do you test a thermocouple?5. Is an ETC control able to be calibrated?6. My 41-205 ignitor is getting red hot but the oven will not work. Why is that?7. My 780-845 (SP845) won't work and is flashing a green LED. What should I do? 8. Why does my furnace's main burner fire up but then goes out after a few seconds?9. What is the required temperature that a thermocouple needs to function?10. Which replacement coil should I use for a reversing valve?11. What is the inlet and outlet size of the 700-504?
12. How to reset the filter message on the PS2110 and PS2210 thermostats?13. What are the millivolt capabilities on the PS series thermostats?
Heating - General1. What is the correct ohm reading for the 41- Series Ignitors?
At room temperature, the OHM reading should be between 45 TO 90 OHMS. If the reading is over 110 OHMS, the ignitor should be replaced. (Back to Top)
2. Can a NL Ignitor replace a PL Ignitor?
An NL ignitor is a non-prepurge one while a PL ignitor has a prepurge cycle prior to the ignition cycle. An NL may be replaced by a PL but a PL can NOT be replaced by an NL. (Back to Top)
3. Can a magnet head be rotated?
In order to get the existing tubing on the application to reach the correct inlet and outlet ports, the head would require a 180° turn. That would mean the main outlet of the safety would be on the same side as the pilot inlet of the head, which of course would put the main inlet on the same side as the pilot outlet. The head can be rotated and will function normally. A few OEMs have manufactured equipment with this backwards design over the years. Service companies normally avoid the rotation of the valve head and use new aluminum tubing to reach the correct port for the pilot but the install time can be cut in half by installing a safety with the rotated head. Rotating the head should be performed only by a qualified, licensed technician. (Back to Top)
4. How do you test a thermocouple?
You must have a millivolt meter. Remember a t-couple is DC voltage so you may need to change to +/- setting. Check the t-couple out of the valve. Go to the valve end of the t-couple. Place a test lead on the outer copper shield and the other lead on the button contact (that screws into the valve). To check the t-couple in the valve while system is active, go to the valve and remove the t-couple. Insert a t-couple test junction in the valve. Connect the t-couple to the test junction. Thermocouples, heated properly, will produce 30 (+/-) millivolts out of the system. During gas valve operation you get about 20-15 as the safety magnet draws on the thermocouple voltage. Change one that produces under 25 out of the system and 15 or less in the system. This is short but to the point. It is easier to change one than to test one unless you have other intermittent problems you are trying to diagnose. (Back to Top)
6. My 41-205 ignitor is getting red hot but the oven will not work. Why is that?
Just because the oven ignitor may be glowing doesn't mean that it is good. A defective or weak oven ignitor is the most common (85% of the time) cause of gas not flowing to the oven burner. Other times it is a defective oven gas valve that is to blame. Over the years we have talked with many qualified service technicians regarding ignitors. We always ask them for their experiences in the field and any conclusions they may have related to these devices. Not one response matches another but the conclusions are close as all refer to certain factors of the numerous applications. These factors (run time, environment, over-cycling, mounting, etc.) play a major role in the life span of the device. Your system may or may not be considering the ideal surroundings required for this ignitor. (Back to Top)
7. My 780-845 (SP845) won't work and is flashing a green LED. What should I do?
The SP845 will display a continuous green LED during normal operation. The SP845 ignition module displays a flashing green LED during an external lockout. The SP845's LED will turn off during an internal lockout. This is the basic operation description of the 780-845 (SP845): A call for heat sends power to the module and after an internal self check and verifying the absense of flame, pre-purge will begin. After pre-purge, the control will start a trial for ignition period. During this time the control will turn on the ignitor and the pilot valve. If flame is detected, the ignitor is turned off after one second and the main gas valve is opened until the call for heat is lost. If the control fails to light gas during the trial for ignition period, the control will do an inter-purge and then try to re-light gas again for the selected number of ignition attempts. If flame is established and is then lost, the control will turn off both the pilot valve and the main valve and will then enter the recycles period and then try again to ignite gas. The control will try to re-light the gas after the flame has been lit and lost for the number of recycle times before locking out with the LED off. If the control fails to establish proof of flame within the specified number of ignition attempts, the control will go to external lockout with the green LED flashing. (Back to Top)
8. Why does my furnace's main burner fire up but then goes out after a few seconds?
The main burner in the furnace lights but goes out after a few seconds. This is usually caused by either a dirty or defective flame sensor. If the flame sensor does not sense a flame, it will shut off the gas flow to the burner. First, turn off the power to your furnace. Next, remove the screw or screws that hold your flame sensor in.
DO NOT CONFUSE THE FLAME SENSOR WITH THE IGNITOR! Do not touch the ignitor. Touching the ignitor will permanently damage it. Clean your flame sensor with light sand paper, steel wool or emery cloth. You might need a new flame sensor, but most of the time they can be cleaned and your furnace will work well after cleaning. If a flame sensor does need replacing, it is almost always due to the white porcelain being cracked which is pretty visible when the sensor is clean. (Back to Top)
9. What is the required temperature that a thermocouple needs to function?
10. Which replacement coil should I use for a reversing valve?
The replacement coil used would depend on the voltage used. • Use LDK-110000-070 for 24 Volt • Use LDK-310000-070 for 120 Volt • Use LDK-410000-070 for 208/240 Volt • Use LDK-510000-070 for 277 Volt (Back to Top)
11. What is the inlet and outlet size of the 700-504?
Model 700-504 has an inlet/outlet size of 1/2" (in) x 3/4" (out). For specifications for all gas valves, click here. (Back to Top)
Heating - Wall Thermostats12. How to reset the filter message on the PS2110 and PS2210 thermostats?
Press and release the filter button, the word “FILT” appears, wait until the numbers appear then hold the FILTER button until the numbers all change to zero, approximately 3-5 seconds. (Back to Top)
13. What are the milli-volt capabilities on the PS series thermostats? The PS2110 and PS2210 can be used in millivolt applications. The limit is the wire length. Please refer to the chart below. (Back to Top)
1. Can O16-107 be used in an ammonia system?2. How do I read the date code? 3. Can you provide some Information about the ETC temp probe? 4. Is an ETC control able to be calibrated?5. Is it possible to extend the ETC Sensor?6. Is the remote sensor submersible?7. What is the part number on a replacement motor for model 8145-20? 8. The temperature of the ETC controller is off by a few degrees, can it I re-calibrate it?9. What is the meaning of NTC?10. What is the meaning of PTC?11. What is the part number for the cover on a 5000-811 thermostat?12. What is the part number for the sensor used on the ERC-2?13. What is the part number of the replacement motor for the model 8145-20?14. How do I read the wiring instructions for the 3100-080 pressure control?15. What are the A30 Temperature Control specifications?16. What are the K Series Temperature Controls specifications?
No. The O16-107 control cannot be used in an ammonia system. We do not make any controls that can be used in that type of application. (Back to Top)
2. How do I read the date code?
The date code is located on the ID label on the back of the display. It is on the left side of the label above the "ASSEMBLED IN" printing.
EXAMPLE: 06150722 = THE 15th DAY OF JUNE 2007 REVISION 22.
The format is MMDDYYRR: MM= 2 DIGIT MONTH NUMBER DD= 2 DIGIT DAY NUMBER YY= 2 DIGIT YEAR NUMBER RR= 2 DIGIT REVISION NUMBER (Back to Top)
3. Can you provide some Information about the ETC temp probe?
4. Is an ETC control able to be calibrated?
5. Is it possible to extend the ETC Sensor?
Yes, the sender wire may be extended. Sensor wire splices should be made external from the control. Additional cable can be spliced to the sensor cable to increase the length beyond the standard 8 feet. It can be extended up to 400 feet. The cable should be at least 22 AWG or larger to keep additional resistance to a minimum. (Back to Top)
6. Is the remote sensor submersible?
The sensor is not made to be immersed in liquid. We have found if you encase the sensor in epoxy it will work. You can also encase it in a well or you could attach the sensor to the outside of the container. (Back to Top)
7. What is the part number on a replacement motor for model 8145-20?
The replacement part number for motor is M1130-20. They can be purchased through outside distributors. (Back to Top)
8. The temperature of the ETC controller is off by a few degrees, can it I re-calibrate it?
The ETC controller can NOT be field calibrated. If the temperature is off, the controller must be replaced. (Back to Top)
9. What is the meaning of NTC?
NTC Stands for Negative Temperature Coefficient. This indicates a thermistor that reads decreasing resistance with decreasing temperature. (Back to Top)
10. What is the meaning of PTC?
PTC Stands for Positive Temperature Coefficient. This indicates a thermistor that reads increasing resistance with increasing temperature. (Back to Top)
11. What is the part number for the cover on a 5000-811 thermostat?
The 5000-811 cover is part #40-070 and it can be purchased through outside distributors. (Back to Top)
12. What is the part number for the sensor used on the ERC-2?
The ERC-2 sensor part number is 1309007-045. It can be purchased through outside distributors. (Back to Top)
13. What is the part number of the replacement motor for the model 8145-20?
The part number for the replacement motor is M1130-20. It can be purchased through outside distributors. (Back to Top)
14. How do I read the wiring instructions for the 3100-080 pressure control?
The wiring information is to be read as follows: 2 = common 1 and 2 = open on pressure increase 2 and 3 = open on pressure decrease (Back to Top)
15. What are the A30 Temperature Control specifications?
For the specifications of all the Ascending series temperature controls, click here. (Back to Top)
16. What are the K Series Temperature Controls specifications?