Lennox Core Unit Controller Setup Manual page 40

SELECTED ALARMS (MARKED WITH * IN TAbLE RESULT IN THE CLOSURE OF THE SERVICE RELAY CONTACTS (DO1).
ALARM
DISPLAY MESSAGE
CODE
37* STRIKE3 FRZ STAT S53 OPEN COMP3
38 FRZ STAT S95 OPEN COMP4
39* STRIKE3 FRZ STAT S95 OPEN COMP4
40 RETURN AIR OVER HEAT LIMIT
41 RETURN AIR UNDER COOL LIMIT
42* BLOWER MOTOR OVERLOAD
STRIKE3 UNIT SHUTDOWN S42 OR
43
S135
44* GAS VALVE ON NO DEMAND GV1
45* GAS VALVE ON NO DEMAND GV2
46 NO 24VAC POWER ON A60
47 NO 24VAC POWER ON A58
48 NO 24VAC POWER ON A61
49 NO 24VAC RELAY POWER ON C3 A59
50 PRIMARY HEAT1 LIMIT OPEN S10
STRIKE3 PRIMARY HEAT1 LIMIT OPEN
51*
S10
52 SECONDARY HEAT1 LIMIT OPEN S21
STRIKE3 SECONDARY HEAT1 LIMIT
53*
OPEN S21
54 HEAT1 S15 LIMIT OR ROLLOUT OPEN
STRIKE3 HEAT1 S15 LIMIT OR
55*
ROLLOUT OPEN
56 HEAT1 CAI SW S18
57* STRIKE3 HEAT1 CAI SW S18
58* HEAT1 NO PROOF GV1
NO FLAME PROOF AFTER TRIALS
59*
GV1
60 PRIMARY HEAT2 LIMIT OPEN S99
STRIKE3 PRIMARY HEAT2 LIMIT OPEN
61*
S99
62 SECONDARY HEAT2 LIMIT OPEN S100
STRIKE3 SEC HEAT2 LIMIT OPEN
63*
S100
64 HEAT2 ROLL OUT OPEN
65* STRIKE3 HEAT2 ROLL OUT OPEN
66 HEAT2 CAI SW
Table 11. CORE Control System Alarm and Event Codes
EVENT ACTION
• Compressor is locked out. Check freezestat, air flow, charge, coil, air filter and
outside air temperature.
• Number of occurrences is set using Parameter 81 (max freeze sat occ). Default is 3
occurrences.
• Compressor is locked out. Check freezestat, air flow, charge, coil, air filter and
outside air temperature.
• Compressor is locked out. Check freezestat, air flow, charge, coil, air filter and
outside air temperature.
• Number of occurrences is set using Parameter 81 (max freeze sat occ). Default is 3
occurrences.
Heat is above set point. Check space conditions and sensors.
Cool is below set point. Check space conditions and sensors.
• System will set an alarm if S42 witch is detected as open. System will automatically
clear alarm once S42 switch is detected closed. System will resume operation
(servicing the demands), after the Error Timed OFF Delay has expired following S42
or S135 clear.
• Check external motor overloads.
S42/ S135 Motor Overload multiple times.
Unit is off. Gas valve 1 has power, but no demand. Check gas valve and wiring.
Unit is off. Gas valve 2 has power, but no demand. Check gas valve and wiring.
No 24VAC relay power on A60 (E1) board, K9-5 input. (A60)
No 24VAC relay power on A58 (G1) board, TB35-1 input. (A58)
No 24VAC relay power on A61(HP1) board, TB34-1 input. (A61)
Third and fourth compressors are off. Alarm automatically clears once 24VAC is present.
The CORE Unit Controller will resume operation once the ERROR TIME OFF DELAY is
completed. Parameter 110 is used to set the reference delay. Factory delay default is 300
seconds.
Heat section 1 primary gas heat limit switch is open. Check air flow, air filter, limit switch
and wiring.
Heat section 1 primary gas heat limit switch is open. Check air flow, air filter, limit switch
and wiring. Number of occurrences is reached.
Heat section 1 secondary gas heat limit switch is open. Check air flow, air filter, limit switch
and wiring.
Heat section 1 secondary gas heat limit switch is open. Check air flow, air filter, limit switch
and wiring. Number of occurrences is reached.
Heat section 1 primary electric heat limit switch is open. Check air flow, air filter, limit
switch and wiring.
Heat section 1 flame roll out burner 1 switch is open. Check gas roll out switch S47.
Check heat section 1 combustion air motor and proof switch.
Check heat section 1 combustion air motor and proof switch. Number of occurrences is
reached.
Check heat section 1 ignition control, flame proof, gas valve 1 and gas supply.
Check heat section 1 ignition control, flame proof, gas valve 1 and gas supply. Number of
occurrences is reached.
Check heat section 2 primary burner limit switch to see if it is open. Check air flow, limit
switch and wiring.
Check heat section 2 primary burner limit switch to see if it is open. Check air flow, limit
switch and wiring. Number of occurrences is reached.
Heat section 2 secondary heat limit switch is open. Check air flow, limit switch and wiring.
Heat section 2 secondary heat limit switch is open. Check air flow, limit switch and wiring.
Number of occurrences is reached.
Flames have been detected outside the gas heater's fire box.
Check roll out sensor and gas supply.
Check heat section 2 combustion air motor and proof switch.
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