DIAGNOSTICS FOR HONEYWELL CONTROL
LED Status | Control Status |
| Probable Cause | |
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| 1. Gas valve is functioning | ||
None (LED not on or | Millivolt power is not |
| normally | |
flashing) | present. Light pilot. | 2. | Gas valve is not powered. | |
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| Light pilot | |
| If set point knob is in | Gas valve is powered and waiting | ||
| for the set point knob to be turned | |||
One flash and three | "PILOT" position then pilot | |||
second pause. | flame is detected. (no | to a water temperature setting. If | ||
the set point knob is at desired | ||||
| faults). | |||
| setting the thermostat is satisfied. | |||
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LED strobe (two quick | Thermostat calling for heat |
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flashes) and three second | Water heater operating normally. | |||
(no faults) | ||||
pause |
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| Set point knob has been | Set point knob was recently turned | ||
| to "OFF" position. Wait until LED | |||
LED on continuously. | recently turned to the | |||
goes out before attempting to | ||||
| "OFF" position. | |||
| relight | |||
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Two flashes and three | Weak pilot flame detected. | 1. | Unstable pilot. | |
System will reset when | 2. | Pilot tube blocked or | ||
second pause. | ||||
pilot flame is sufficient. |
| restricted. | ||
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Three flashes and three | Insufficient water heating. | 1. | Temperature sensor out of | |
second pause. | System will reset. |
| calibration. | |
2. | Possible short. | |||
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Four flashes and three | Excessive tank | 1. | Temperature sensor out of | |
temperature. System must |
| calibration. | ||
second pause. |
| |||
be reset. | 2. | Faulty gas valve. | ||
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| 1. | Damage to the temperature | |
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| wire. | |
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| 2. | Temperature sensor | |
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| resistance out of range. | |
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| 3. | Replace temperature sensor. | |
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| 4. | If temperature sensor | |
Five flashes and three |
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| replacement does not correct | |
Temperature sensor fault. |
| the problem; Verify control is | ||
second pause. |
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| not wet or physically damaged | ||
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| 5. | Turn set point knob to "OFF" | |
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| position. Turn set point knob | |
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| to "PILOT" position and light | |
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| pilot. | |
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| 6. | Replace gas valve if five flash | |
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| error persists. |
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