Troubleshooting
Observe the green LED on the water heater gas con- trol. Error codes are displayed with a 3 second pause before repeating. Once the error code is known, check and repair the water heater, as recommended in the table below.
Green LED
LED Status | Control Status |
| Probable Cause | Service Procedure | |
None (LED |
| Control power switch in "OFF" |
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not on or | No electrical power | position. | Turn Power On | ||
flashing) |
| Supply voltage interrupted. |
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One short | Temperature demand is satisfied |
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flash every | Thermostat is | Normal operation | |||
four seconds | satisfied (no faults) | (no call for heat) |
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Alternates |
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bright and | Thermostat calling | Tank temperature below | Normal operation | ||
dim | for heat (no fault) | setpoint of thermostat | |||
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(heartbeat) |
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| 1. | Unstable pilot |
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| 2. | Pilot tube blocked or restricted | 1. See Burner Inspection on | |
Short flash | Weak pilot signal | 3. | Oxidation | page 20 | |
once every | electrode | ||||
second | on last call for heat | 4. | Wire damage to pilot | Testing and Replacement on | |
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| assembly or bad connection at | page 22 | ||
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| gas control |
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| 1. | Pressure switch tubing kinked |
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Two flashes, | Pressure switch not | or blocked | |||
three second | 2. | Blocked pressure tap on | |||
Testing on page 25 | |||||
pause | position | switch or blower | |||
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| 3. | Faulty pressure switch |
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| 1. | Vent blockage or improper |
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| vent configuration |
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| 2. | Pressure switch tubing kinked | 1. Check vent or vent tables | |
Three | Pressure switch or | or blocked | |||
flashes, | blower temperature | 3. | Faulty pressure switch | Testing on page 25 | |
three second | switch not working- | 4. | Blower not spinning up to | 4. See Blower Testing on | |
pause | open position | speed | page 28 | ||
5. | Blower temperature or | ||||
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| exhaust temperature too high | Switch Testing on page 31 | ||
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| 6. | Faulty blower temperature |
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| switch |
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Four flashes, | Excessive tank | 1. | Thermal well sensor out of | 1. Test Gas Control & Thermal | |
temperature, | Well | ||||
three second | calibration | ||||
system must be | 2. Replace gas control if | ||||
pause | 2. | Faulty gas control | |||
reset | necessary | ||||
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Five flashes, | False pilot flame |
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three second | Pilot valve stuck in open position | Replace gas control | |||
present | |||||
pause |
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