
Error Codes
This appliance has the ability to check its own operation continuously. If a fault occurs, an error code will flash on the Display of the temperature controller. This assists with diagnosing the fault and may enable you to overcome a problem without a service call. Please identify the code displayed when inquiring about service.
Error Code Table
| Code | Fault | Remedy | 
| 02 | No burner operation during | Service Call | 
| 
 | freeze protection mode | 
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| 
 | 
 | 
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| 10 | Air Supply or Exhaust | Ensure approved venting materials are being used. | 
| 
 | Blockage | Check that nothing is blocking the flue inlet or exhaust. | 
| 
 | 
 | Check all vent components for proper connections. | 
| 
 | 
 | Ensure vent length is within limits. | 
| 
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 | Ensure condensation collar was installed correctly. | 
| 
 | 
 | Verify dip switches are set properly. | 
| 
 | 
 | Check fan for blockage. | 
| 
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 | 
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| 11 | No Ignition | Check that the gas is turned on at the water heater, gas meter, or cylinder. | 
| 
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 | Ensure gas type and pressure is correct. | 
| 
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 | Ensure gas line, meter, and/or regulator is sized properly. | 
| 
 | 
 | Bleed all air from gas lines. | 
| 
 | 
 | Verify dip switches are set properly. | 
| 
 | 
 | Ensure appliance is properly grounded. | 
| 
 | 
 | Disconnect all  | 
| 
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 | Ensure igniter is operational. | 
| 
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 | Check igniter wiring harness for damage. | 
| 
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 | Check gas solenoid valves for open or short circuits. | 
| 
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 | Remove burner cover and ensure all burners are properly seated. | 
| 
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 | Remove burner plate and inspect burner surface for condensation or debris. | 
| 12 | Flame Failure | Check that the gas is turned on at the water heater and gas meter. Check for | 
| 
 | 
 | obstructions in the flue outlet. | 
| 
 | 
 | Ensure gas line, meter, and/or regulator is sized properly. | 
| 
 | 
 | Ensure gas type and pressure is correct. | 
| 
 | 
 | Bleed all air from gas lines. | 
| 
 | 
 | Ensure proper venting material was installed. | 
| 
 | 
 | Ensure condensation collar was installed properly. | 
| 
 | 
 | Ensure vent length is within limits. | 
| 
 | 
 | Verify dip switches are set properly. | 
| 
 | 
 | Ensure appliance is properly grounded. | 
| 
 | 
 | Disconnect keypad. | 
| 
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 | Disconnect all  | 
| 
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 | Check power supply for loose connections. | 
| 
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 | Check power supply for proper voltage and voltage drops. | 
| 
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 | Ensure flame rod wire is connected. | 
| 
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 | Check flame rod for carbon  | 
| 
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 | Disconnect and reconnect all wiring harnesses on unit and PC board. | 
| 
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 | Check all components for electrical short. | 
| 
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 | Check gas solenoid valves for open or short circuits. | 
| 
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 | Remove burner plate and inspect burner surface for condensation or debris. | 
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| 305, 505, 705 Indoor Manual | 9 |