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If you are saying this happens on a really cold night, the assumption is that on milder nights, it seems to work adequately.....If that's the case, there is a possibility that it is marginally sized in capacity to heat the space in which it is installed. If it has a "fresh air" damper setting, make sure that is closed completely, because that is air directly from outside the structure that is being brought in through the blower and adds more load to the space and makes the discharge air feel colder.
Hi, It could be the relay or the strip heat.... To figure out what is wrong you will need to check if power is getting to the strip heat or not...should have 220-240 V across the two legs going to the heat strip...when the heat should be on.
Unplug the set and hold the power button for 30 seconds. Plug it back in and see if that fixes it. If it doesn't then it sounds like there is a problem on the board underneath the power button. Something isn't allowing the circuit to be cut.