PC board bad?
I have a trane xe 90, or ex 90, (gas) I forget, and the problem is this. The unit will cycle off and not come back on. The blower keeps running but I can turn it off at the thermostat. I get a "4 flash code on the bite light which is high temp limit. Cahnged out the hi temp swtch and the same thing. Eventually changed the pc board and now I get 6 flashes on the bite light which is reverse polarity or weak/bad ground. reversed the polarity and added a ground, which I did not have, but still get the same thing only witht the "new" PC board, I cannot turn off the blower,which runs all the time, at thermostat, I have to pull the breaker to get it to stop. I have better luck with the old PC board than the new one. All the limit swtchs appear to check out good. The trane man said that prolonged use with no ground can eat up the PC board. Any help will be nice AND warm... Thanks, MOnty
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