Quote:
Originally Posted by Xringer
The snow storm we had the other day caused a power glitch..
Which I now think was about 1/2 a second long or less. I'm not sure, but I think the den Sanyo was defrosting.
When I went outside to check, the coil was 60% caked with snow and ice.
Somehow the system was damaged and has failed..
Power up shows a flashing 'Operate' LED indicating failure mode.
TED power meter shows zero power used, unless in Fan mode (works nice).
Diagnostic code is S01. Room temp sensor failure (or other sensors?)
or Indoor/Outdoor PCB failure. (Room temp is in the remote control).
I don't think it's the indoor unit (my newest purchase. Less than 4 years ago),
Since it's running the Diagnostics okay. I think these Diag results may be too general..
Today it was 40F, so I removed the top cover of the outdoor unit and checked the power into the unit.
Everything looked fine. The DIY 10A circuit breaker is normal..
But, I could not get the plastic cover off the main controller board,
to see if the was any damage to the PCB or parts.
I cut off the power and left it un-repaired for now.
I'll wait for better weather, so I can remove the snow roof and remove both
the top and front covers, allowing better access to the main PCB and sensor connectors.
Since the outdoor unit stopped drawing crankcase heater current (40w), and its been really cold,
I can assume the main controller PCB isn't pulling in the relay to power the heater..
I do want to measure the Ohms of that heater, in case it's open..
Because, there is a temp sensor on the compressor..
And a smart controller would not fire up the compressor motor,
until the oil had warmed up.. (I would hope)..
I have a 'feeling' the main board's logic has been zapped.. ($1,100).
But, maybe it's the man DC PSU capacitors, which I might be able to replace.
Sometimes when they go bad, they make a mess on the board, or their end caps are puffed out..
Have to wait and see..
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Yes, it's almost springtime here in MA.. Actually going to be warm today!
I'm looking at the top of the outdoor PCB and I think that backwards 'Z' on the bottom right (about 2" in from the sides) is a 25A fuse.. It's showing 'open' on the VOM.. Is that really the symbol for a fuse? Or a Zener diode?
I can bend the PCB a little and peek underneath. It looks like an old style glass germanium diode.. I have no idea how to remove the PCB yet..
If that is the fuse, the question is, what caused it to blow? I need to replace it, to see if something down the chain has shorted out..
