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CBX40UHV
Table 13. AHC Single Character Display Alert Codes (Communicating and Non-Communicating) (continued)
Alert
Code
Priority
Alert How to Clear
Critical
The O relay on the air-handler has fai
led. Either the pilot relay contacts did
not close or the relay coil did not ener
gize
O relay failed. Pilot relay contacts did not close or the relay coil did not energize. Re
place control. The alarm clears after a reset.
Critical
The R to O jumper was not removed on
the air-handler control board
Configuration link(s) not removed on control. Cut / remove R to O jumper. Applicable
with non communicating outdoor unit with communicating indoor unit. The fault clears
after the R to O jumper is cut/removed.
Critical
The Y1 relay on the air-handler has
failed. Either the pilot relay contacts did
not close or the relay coil did not ener
gize.
Operation stopped. Y1 relay failed. Pilot relay contacts did not close or the relay coil
did not energize. The indoor unit cannot verify that the relay is closed. The alarm
clears after a reset and Y1 input sensed.
Critical
The Y2 relay on the air-handler has fai
led. Either the pilot relay contacts did
not close or the relay coil did not ener
gize.
Operation stopped. Y2 relay failed. Pilot relay contacts did not close or the relay coil
did not energize. The indoor unit cannot verify that the relay is closed. The alarm
clears after a reset and Y2 input sensed.
Critical
The air-handler's electric heat is not
configured.
Heat call with no configured or mis-configured electric heat. Configure electric heat
in the air-handler. The fault clears electrical heat is successfully detected.
Critical
There is a problem with the air-han
dler's first stage electric heat. Either the
pilot relay contacts did not close, or the
relay coil in the electric heat section did
not energize.
Heat section / stage 1 failed. Pilot relay contacts did not close, or the relay coil in the
electric heat section did not energize. The alarm clears after stage 1 relay is detected.
Critical
There is a problem with the air-han
dler's second stage electric heat. Either
the pilot relay contacts did not close, or
the relay coil in the electric heat section
did not energize. The air-handler will
operate on first stage electric heat until
the issue is resolved.
Heat section / stage 2 failed (same as code 351). Pilot relay contacts did not close,
or the relay coil in the electric heat section did not energize. The air-handler will oper
ate on stage 1 heat only. The alarm clears after stage 2 relay is detected.
Critical
There is a problem with the air-han
dler's third stage electric heat. Either
the pilot relay contacts did not close, or
the relay coil in the electric heat section
did not energize. The air-handler will
operate on first stage electric heat until
the issue is resolved.
Heat section / stage 3 failed (same as code 351). Pilot relay contacts did not close,
or the relay coil in the electric heat section did not energize. The air-handler will oper
ate on stage 1 heat only. The alarm clears after sage 2 relay is detected.
Critical
There is a problem with the air-han
dler's fourth stage electric heat. Either
the pilot relay contacts did not close, or
the relay coil in the electric heat section
did not energize. The air-handler will
operate on first stage electric heat until
the issue is resolved.
Heat section / stage 4 failed (same as code 351). Pilot relay contacts did not close,
or the relay coil in the electric heat section did not energize. The air-handler will oper
ate on stage 1 heat only. The alarm clears after stage 2 relay is detected.
Critical
There is a problem with the air-han
dler's fifth stage electric heat. Either the
pilot relay contacts did not close, or the
relay coil in the electric heat section did
not energize. The air-handler will oper
ate on first stage electric heat until the
issue is resolved.
Heat section / stage 5 failed (same as code 351). Pilot relay contacts did not close,
or the relay coil in the electric heat section did not energize. The air-handler will oper
ate on stage 1 heat only. The alarm clears after stage 2 relay is detected.
Moder
ate
The secondary voltage for the air-hand
ler has fallen below 18VAC. If this con
tinues for 10 minutes, the iComfort™
thermostat will turn off the air-handler.
Secondary voltage is below 18VAC. After 10 minutes, operation is discontinued.
Check the indoor line voltage, transformer output voltage. The alarm clears after the
voltage is higher than 20VAC for 2 seconds or after a power reset.
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