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Sounds like an air pocket in the coolant system. Those can be a pain, some cars have bleed valves to help. If there is an air pocket, it will seem to be full of coolant, but when the air pocket gets to the heater core it gets stuck there and guess what? No heat, because you won't get any heat unless hot coolant is in the heater core. Old fashioned way is to open the system and keep pouring coolant in at operating temp with heat on full until all the air is pushed out. If it has a bleed valve that can be helpful. Have seen this problem on many vehicles.
I had the same problem. It is caused by a failure in the thermostat, usually brought on by a power surge. Unfortunately, this product is poorly designed, and cannot handle common power surges in homes. The only solution is to replace the thermostat unit. Nuheat has a decent warranty (3 years) so you may qualify for a free replacement.
one of my customers had the same fault recently. We tryed to reset the radio connection but, the appliance still did not respond.
The receiver was disconnected for the evening to prove boiler and system functionality which was ok.
Next day we installed new receiver & followed set up. customer has had no symptoms for 2 mnths.
Hope this helps.