Ruud heat pump outdoor coil.
Cools just fine.
Switch over to heating and
the outdoor unit throws an error code,
something like "coil sensor fail", (or failure or similar).
Model number is UPNE-036JAZ
The unit had been heating fine. Indoor unit, air-handler,
was swapped out with a Bryant. Basic Honeywell tstat.
Pro4000. Switched to heat pump. Advanced setup
menu item 1 switched to heat pump as well.
Am I going nuts or was I wrong to expect to see
control voltage at Y terminal at the air-handler
and outside unit upon a call for heat?
Five minute delay was taken into account.
Had to leave before I could systematically troubleshoot.
I don't even get to return tomorrow. Senior guy is going
out to ensure customer is happy.
I'm simply puzzled and have to know what the problem is.
For starters, what does Ruud mean by a "coil sensor fail"?