Applied Air GAS-FIRED HEATERS, Installation & Operation Instruction

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Blinking Fault Codes and Recommended Troubleshooting
Recommended Troubleshooting Fault Code System Failure
Code 5-3
*Man-Open
Sw.; Start Sw.
or Control On*
Code 6-1
*Internal Faults*
Code 6-2
*Internal Faults*
Code 6-3
*Device
Specifi c*
Code 6-4
*Accessory
Fault*
Code 7-7
*Unused*
Man-Open Switch, Start
Switch or Control On in
the wrong operational
state.
Relay Module self-test
failure.
Relay Module Self-Test
failure.
Fault with special OEM
input circuits.
Unused at this time.
Unused at this time.
1. Check wiring and correct any errors.
2. Make sure that the Manual Open Valve Switch, Start Switch and Control are
operating properly.
3. Stat Switch held ìOnî too long.
4. Reset and sequence the relay module.
5. Reset and sequence the relay module. If the fault persists, replace the relay module
(RM7838A1014; RM7838B1013 or RM7838C1004 only).
1. Reset and sequence the relay module.
2. If fault reappears, remove power from the device, reapply power, then reset and
sequence the relay module.
3. If the fault persists, replace the relay module.
1. Reset and sequence the relay module.
2. If fault reappears, remove power from the device, reapply power, then reset and
sequence the relay module.
3. If fault does not repeat on the next cycle, check for electrical noise being copied
into the relay module through the external loads or possibly an electrical grounding
issue.
4. If the fault persists, replace the relay module.
1. Check wiring and operation of special OEM inputs.
2. Reset and sequence the relay module.
3. If fault reappears, remove power from the device, reapply power, then reset and
sequence the relay module.
4. If the fault does not repeat on the next cycle, check for electrical noise being copied
into the relay module through the external loads or possibly an electrical grounding
issue.
5. If the fault persists, replace the relay module.
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