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Is Green
Power LED
light on and
no Red
Blink Code?
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Yes
Is there
power to
Yes
the "Y" Call
(C-Y)?
No
- Check all
No
power supplies
- Check all
safety switches
&( 6SOLW 6HULHV
UPM Board
Yes
is Good
Is there 24 V
power from
C to CC?
Check for Red
No
Blink Code.
If Red Blink
Code is not
Check
present, replace
thermostat
UPM Board
settings and
configurations
for heat
pumps, and
wiring
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