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re heater
Does the orange light come on (over temp) when the heater shuts down ?
If it overtemps then it must be combustion air (not enough). The thermosat should cycle the heater. If you run the thermostat all the way down does the heater cycle at all ?
Perhaps you are looking at a wiring problem and not the heater. A chaffed wire ?
90% of the time they just don't fire. This one is really strange since you have replaced the heater in its entirety.
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