12.1 Control LED
The control inside the heater's control compartment is equipped with a
GREEN indicates normal operation.
RED indicates an error condition.
YELLOW (fast flashing) indicates a RETRY attempt.
LED NOT LIT indicates no power to control.
12.2 General LED Codes
No LED: | No Power to control. |
Slow Green: | LED slowly flashes on and off, |
| indicates power to the control |
| board but no call for heat. |
GREEN, 1 flash: | Call for heat indicates the |
| heater is performing the safe |
| start |
| H.S.I. |
GREEN, 2 flashes: | Call for heat indicates the |
| heater is performing light off, |
| heater |
GREEN, 3 flashes: | *Only applicable for |
| thermostat control* |
| Gas ON - No call for heat, unit |
| modulating from single stage |
| thermostat. |
AMBER, 1 flash: | Call for heat when flame signal |
| is below 1µA |
AMBER, 2 flashes: | Gas ON - Call for heat when |
| flame signal is below 1µA |
AMBER, 3 flashes: | *Only applicable for |
| thermostat control* |
| Gas ON - No call for heat, unit |
| modulating from single stage |
| thermostat when flame signal |
| is below 1µA. |
60 of 71
AMBER, |
|
Fast Flashing: | Heater is in RETRY mode. |
RED Steady LED: | Control FAILURE, |
| No 24 V power supply. |
RED, 1 flash: | Lockout- Insufficient sensed |
| air pressure when blower is |
| on. |
| Condition could be caused by: |
| • Air Side Door |
| • Blower |
| • Obstruction in |
| inlet or outlet |
| • Pressure hose fittings |
| • Pressure Switch |
RED, 2 flashes: | Lockout- Blower air pressure |
| reads above zero level when |
| blower is off. |
| Condition is caused by |
| a pressure sensor failure or |
| complete blockage of air |
| intake or exhaust vent. |
RED, 3 flashes: | Lockout- Flame is sensed on |
| when it should be off or off |
| when it should be on. |
| Could be caused by: |
| • Flame Rod |
| • H.S.I. |
| • Gas Supply |
| • 120 V Supply Polarity |
| • Board Fault |
RED, 4 flashes: | Lockout- Gas Valve. |
| Condition caused by main |
| valve on gas valve. |
| Check gas valve wiring. |
RED, 5 flashes: | Lockout- Board Failure. |
| Board must be replaced. |
RED, 6 flashes: | Not used. |
RED, 7 flashes: | Lockout- Fuse Open. |
| Condition could be caused by: |
| • Fuse blown |
| • High Limit Switch open a |
| board location J3 |