5-Wire Thermostat replacement for Carrier 58PAV070 (-12)


Old 12-10-13, 02:37 PM
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5-Wire Thermostat replacement for Carrier 58PAV070 (-12)

I recently had to replace my t-stat for the heating unit: Carrier 58PAV070.
I removed and replaced the old one (make unknown) with the Honeywell CT31A 4-wire unit.

I matched up all signals based on color codes and terminal lugs:
W -> W
R -> R
Y -> Y
G -> G
this left a BLUE wire unaccounted for which I taped off.

sadly I did this at the end of summer and, after weeks of tossing the t-stat around, I finally throw it out failing to consider the HEATING side of the story - now I have come to realize my heater no longer turns on.

The error indicator on the unit is solid red (normal?).
AC works fine, just no heat - no flame, nothing.

any help on restoring the heat would be appreciated.
I believe it comes down to the BLUE wire marked "C" which has no corresponding lug for model CT31A t-stat.
* also- I failed to power down heater prior to removal of t-stat: live & learn.

Thanks in advance.
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Old 12-10-13, 05:42 PM
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Jump therminals R&W at the furnace. If it comes on, the problem is with the stat or between the stat & furnace.
Old 12-10-13, 05:55 PM
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Welcome to the forums.

The red LED on means you have power and didn't blow a fuse.
You only need four wires to activate the furnace for heating and cooling and it appears you have them on the correct terminals. If the blue wire is connected to C at the furnace then you csn just tape it off.

The link below is the manual for your furnace. Check page 9 and 10 as it describes the diagnostic method used to determine problems.

Carrier groups public documents - techlit.PDF

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