Question about Heating & Cooling
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Posted on Jan 02, 2017
The location of the sensor needs to be higher but my yellow wire would only pull out a couple of inches.
Turn off power to unit and remove front panel. Two screws near top/sides. Top of panel pulls out (unplug wire connector to indicator lights) and lifts off bottom tangs. Now you will see a coil of yellow wire inside unit. Remove the wire tie and you'll have enough yellow wire to locate the sensor well above the heater.
Posted on Dec 31, 2007
it sounds like the problem may be in the boiler and not the controller itself. Do you kno which is are the two wores that are the r-w for the thermostat take and purt them together and see if the boiler stays on or shuts off like it does with the thermostat. If it does then replace the reciever. If it doesn't then you have another problem. Good Luck
Posted on Jan 07, 2009
Chances are if the varistor fails, it fails drastically causing a short circuit across the supply. It will sit across the supply (it will look like a thick ceramic capacitor) and you can check for continuity after isolating that at one end. If it shows low resistance (it should show almost open circuit with a Digital meter), replace it.
It need not be the culprit. If you are familiar working with High voltage circuits ( they are lethal inside a microwave ovens as the current capability is high here), you can discharge the doubler capacitor and isolate the high voltage diode to check for shorts in the HT area.
Posted on Mar 18, 2009
Hello. It is hard to say exactly what is going on, but here it goes. First, are you sure it is getting to temp? use a thermometer. if so, then, you could have a weak hi limit, tripping at 350 or 375, instead of 450. Do you have to reset it? or let it cool down? or does it light right back up. If not, then you probably have a weak thermopile, not producing the correct millivoltage ( less than half of a AAA battery ), it normally is 450 to 750 millivolts.You can test this with a multimeter, one side to the thick copper wire coming from the pilot, and the other at one of the hi-limit wires, DC voltage please. Grease could be on/in any of the aforementioned components, causing a poor connection, with less than half an AAA battery, it does not take much to cause a problem. A dirty pilot, or low gas pressure could also cause a problem.
Hope that helped, and thank you.
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Posted on Apr 20, 2009
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