Honeywell 51370B Manal page 41

Troubleshooting continued-
LED Status
Six flashes‐two
flashes, three second
pause (Soft lockout)
Six flashes‐three
flashes, three second
pause (Soft lockout)
Six flashes‐four
flashes, three second
pause (Soft lockout)
Seven flashes, three
second pause
Eight flashes‐one
flash, three second
pause
Eight flashes, two
flashes, three second
pause
Eight flashes‐three
flashes, three second
pause
Eight flashes‐four
flashes, three second
pause
Control Status
Pressure switch or
blower temperature
switch opened
during burner
operation.
System auto resets
after 5 minutes.
Pilot flame
extinguished.
System resets after 5
minutes.
Undesired‐false pilot
flame sensed.
System auto resets.
Flammable vapor
sensor fault
detected, see
warning label
Flammable vapor
sensor out of
specification.
Possible short.
Temperature sensor
fault
Electronics fault
detected
Gas valve fault
detected.
Probable Cause
1. Pressure switch tubing kinked or blocked.
2. Vent blockage or improper vent configuration.
3. Vent termination being affected by windy
conditions.
4. Blower not spinning up to speed.
5. Vent temperature too high.
6. Faulty pressure switch or blower temp. switch.
1. Unstable pilot.
2. Pilot tube blocked or restricted.
3. Oxidation build up on pilot electrode.
4. Wire damage to pilot assembly or bad
connection at gas valve.
5. Insufficient combustion air.
Pilot valve stuck in open position.
1. Flammable vapor present
2. Flammable vapor sensor exposed to excessive
moisture
3. Flammable vapor sensor exposed to extreme
ambient temp
1. Flammable vapor sensor out of specification
2. Possible short.
1. Damage to sensor or wire in control's well.
2. Control's sensor resistance out of range.
3. Replace control.
1. Verify control is not wet or physically damaged
2. Reset control on/off switch.
3. Replace electronic module if 8‐3 error persists
1. Verify control is not wet or physically damaged.
2. Reset control on/off switch.
3. Replace gas control if 8‐4 error persists
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