Gas valve solenoid coil resistance too low?hi guy's this is the thermocoupler i use one year I had to replace it two times is there something I'm missing here. its on a boiler that heat's the house.
Honeywell 36 In. Lead Length Universal Thermocoupler - Gas
thanks do you have any pictures so i can see what I'm suppose to replace or at lease have an idea when i call a repair guyGas valve solenoid coil resistance too low?
Two defective TCs?
hi guy's this is the thermocoupler i use one year I had to replace it two times is there something I'm missing here. its on a boiler that heat's the house.
Honeywell 36 In. Lead Length Universal Thermocoupler - Gas
While I have your attention, do you have any factory spec's on mV or 24 vac gas valve solenoid min. voltage/min. current requirements? A lot of people want to use a 1.5v AA cell to check a mV valve, and these spec's will probably show it is damaging to the valve.Ignore this procedure, or atleast the valid times it gives for how long the drop out should take. Unless you have a Bosch water heater but I reread the entire post and don't see where you said you had one.
While I have your attention, do you have any factory spec's on mV or 24 vac gas valve solenoid min. voltage/min. current requirements? A lot of people want to use a 1.5v AA cell to check a mV valve, and these spec's will probably show it is damaging to the valve.
Thanks.
What current does the 28mV valve take to open? That's a spec I can't find.Well a mV gas valve running off of a thermocouple uses about 28mV.... I don't know if a 1.5v AA battery would hurt it but I wouldn't think it's good for it.
What current does the 28mV valve take to open? That's a spec I can't find.
What about the current those valves draw that use a 750 mV TC? These TCs have an internal resistance of 3 ohms so pulling 125 mA to run the valve would drop the valve voltage to ~370 mV.
A thermocouple that gets too hot will fail, or more precisely will stop generating power to maintain the coil in an open position. IF the main burner flame is so large it is encompassing the thermocouple, or if the pilot light is not on the tip of the thermocouple, its operation will be erratic. Overheating and age are about the only two causes of thermocouple failure, and if yours are going bad that quickly age is probably not the cause.
Put in a brand new thermocouple and do a drop out test on it to see how strong of signal it's putting out.
If it puts out a weak signal try another new thermocouple (some are just bad from the factory). If BOTH seem to be putting out weak signals it's quite possible your gas valve is starting to fail.
Wouldn't the best thing be to call a service tech out to check the gas valve and thermocouple? They have the proper test equiment.
This is awkward, but...
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