Lennox CBX40UHV Series Installation And Service Procedure page 37

Table 13. AHC Single Character Display Alert Codes (Communicating and Non-Communicating) (continued)
Alert
Alert
Priority
Code
The O relay on the air-handler has fai­
E345 led. Either the pilot relay contacts did
Critical
not close or the relay coil did not ener­
gize
The R to O jumper was not removed on
E346
Critical
the air-handler control board
The Y1 relay on the air-handler has
E347 failed. Either the pilot relay contacts did
Critical
not close or the relay coil did not ener­
gize.
The Y2 relay on the air-handler has fai­
E348 led. Either the pilot relay contacts did
Critical
not close or the relay coil did not ener­
gize.
E350 The air-handler's electric heat is not
Critical
configured.
There is a problem with the air-han­
dler's first stage electric heat. Either the
E351
Critical pilot relay contacts did not close, or the
relay coil in the electric heat section did
not energize.
There is a problem with the air-han­
dler's second stage electric heat. Either
the pilot relay contacts did not close, or
E352
the relay coil in the electric heat section
Critical
did not energize. The air-handler will
operate on first stage electric heat until
the issue is resolved.
There is a problem with the air-han­
dler's third stage electric heat. Either
the pilot relay contacts did not close, or
E353
the relay coil in the electric heat section
Critical
did not energize. The air-handler will
operate on first stage electric heat until
the issue is resolved.
There is a problem with the air-han­
dler's fourth stage electric heat. Either
the pilot relay contacts did not close, or
E354
the relay coil in the electric heat section
Critical
did not energize. The air-handler will
operate on first stage electric heat until
the issue is resolved.
There is a problem with the air-han­
dler's fifth stage electric heat. Either the
pilot relay contacts did not close, or the
E355
relay coil in the electric heat section did
Critical
not energize. The air-handler will oper­
ate on first stage electric heat until the
issue is resolved.
The secondary voltage for the air-hand­
Moder­
E409 ler has fallen below 18VAC. If this con­
ate tinues for 10 minutes, the iComfort™
thermostat will turn off the air-handler.
CBX40UHV
How to Clear
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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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