Error code E9 after hearing a high pitch nosie our heater has an E9 error code help High pitched noise is from a very high CO2 level. Adjust the gas pressure to stay above 11" w.c. and have a gas ...
...error code think the heat exchanger overheat sensor may be bad. Before calling service technician, copy following links for troubleshoot ...
...error code on unit says E1. This has been going on intermittently for about 2 months. Normal fix is: powering off the unit, reset it and let it cool down. Usually runs fine for another 2 weeks then ...
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