Jon Davis
30-05-2010, 11:05 AM
Symptoms (on heating) are that the internal unit fans start up OK, but after a minute or so everthing stops with error code U2 on the control panel, and H2P LED lit up on the outdoor unit. Neither the outdoor unit fans or the compressor showed any signs of starting. The two LED's on the indoor unit were flashing as normal (presumibly showing that microprocessor and communications were OK).
U2 code is supposed to be low voltage or low instantaneous voltage. Checked for both of these on a Fluke logging meter and voltage was steady at around 236V. H2P error is stated as motor phase error or main capactitor faulty, but measured the cap and it read 2200uF which is what it's supposed to be.
Thermistor sensors seemed to read OK i.e three read about 23K ohms and one read about 230K ohms (I understand from searching other related threads on the forum that one sensor can be expected to read about 10 times higher resistance that the others).
Have I missed something? Does this sound like a failed outdoor unit main processor/motor-control pcb failure?
Any assistance would be appreciated (before I replace the main board - in case I'm wrong!)
Cheers,
Jon
U2 code is supposed to be low voltage or low instantaneous voltage. Checked for both of these on a Fluke logging meter and voltage was steady at around 236V. H2P error is stated as motor phase error or main capactitor faulty, but measured the cap and it read 2200uF which is what it's supposed to be.
Thermistor sensors seemed to read OK i.e three read about 23K ohms and one read about 230K ohms (I understand from searching other related threads on the forum that one sensor can be expected to read about 10 times higher resistance that the others).
Have I missed something? Does this sound like a failed outdoor unit main processor/motor-control pcb failure?
Any assistance would be appreciated (before I replace the main board - in case I'm wrong!)
Cheers,
Jon