Unit not running; thermostat wires jumped and it runs. Replaced thermostat and it ran for 5 minutes then stopped. Jumped thermostat wires again and unit started running. Any suggestions?
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Hello You have only 5 wires? multi stage if so ,is run by something else.Check that RH/RC is jumped out on new stat.Also check that O is not on the B terminal.If there is an A/B select switch set it to O.Emergency heat button dont matter as there is no wire to run it with only 5 wires.
check the sending unit,also when last you serviced the radiator? it may be restricted,also check the fan speed, if equip with a viscos couplier replace,
Best bet would be the temp. sender unit.Its probably not working.For the gauge to jump up suddenly,that is a symptom.Replace it.Gheap and easy to do.Hope this helps
I just solved this about an hour ago. It's the connection from the circuit board to the ignitor. The same thing happened to me that it ran a long time and then it wouldn't. At some point it loses spark. The large wire from the board to thee= ignitor is the culprit. Take the ignitor out and press the two electrodes to about 1/4"-3/8max. Clean the surface plate where it meets the heater and also clean the brass piece on the othe end. Then clean the brass piece on the circuit board. Slide the 2 boots down a little and expose the receptacles. Press them a little with pliers, put them on their respective connections and then slide the boots back on. It started right up and has been running since! This after I bought a new gas valve $178! Let me know if this does it for you.
Sound like there are running on emergency heat which is elrctric.Have the system checked out buy a local heating and cooling company. Have they checked the filter and changed them.
Your house might be older. Are your receptacles two-prong, or three?
I would ignore the missing "G" wire, and connect Red to both Rc and Rh, and Y to Y, and W to W.
I asked a local repair shop. Just pull ******* the sensor wire and it will slip out of the tube through which it runs. Run the new wire which is attached to the new thermostat thru the same tube. Prior to purchasing the thermostat, I tested with a ohm meter for continuity ( there was none) and jumped the attaching power wires. The compressor ran verifying the problem with the thermostat. Thermostat cost $47.00.
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