CONTROL DISPLAY TROUBLESHOOTING
| CONTROL DISPLAY STATUS | PROBLEM |
| SOLUTION | |
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6. |
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| 1. Clean the screen on the combustion air | ||
The air pressure switch contacts | intake chamber. Turn the power “OFF” for | ||||
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| remain open longer than 11 | 10 to 20 seconds then “ON” again to clear | ||
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| seconds after the combustion fan | the error code. If the problem persists: | ||
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| is energized. | 2. Ensure the pressure switch sensing tube | ||
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| is in good condition and securely | ||
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| connected at both ends. | ||
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| 3. Ensure the inner door to the combustion | ||
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| chamber is secure and the gasket is | ||
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| properly sealing. | ||
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| 4. Check operation of the air intake chamber | ||
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| fan and pressure switch. | ||
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| A. | Turn off power to the water heater. | |
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| B. Remove the tubing from the pressure | ||
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| switch and the wires from both | |
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| terminals of the pressure switch. | |
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| C. Connect a digital manometer to the | ||
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| open end of the tubing from the air | |
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| intake chamber. Turn on the power to | |
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| the water heater and when the fan turns | |
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| on, measure the pressure reading in the | |
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| tubing. If the pressure reading reaches | |
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| the .22” WC make point of the pressure | |
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| switch, turn off power to the water | |
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| heater and reconnect tubing to the | |
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| pressure switch. If pressure reading does | |
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| not reach the .22” WC make point, check | |
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| the system and tubing for restrictions | |
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| and cleanliness. | |
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| D. Attach leads of ohmmeter or continuity | ||
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| tester to the terminals of the pressure | |
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| switch. Turn on power to the water | |
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| heater and when the air intake fan | |
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| comes on, check for continuity across | |
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| the pressure switch contacts. If switch | |
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| contacts remain open (no continuity) | |
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| while the fan is in operation - replace | |
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| the pressure switch. | |
7. |
| The air pressure switch contacts | 1. Turn off power to the water heater. | ||
2. Locate the pressure switch wiring – | |||||
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| remain closed for more than 5 | |||
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| ensure pressure switch wiring is correct | |||
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| seconds when they should be | |||
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| and not jumped. | |||
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| open. | |||
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| 3. Remove wires to both terminals on | |||
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| pressure switch. | ||
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| 4. Check pressure switch contacts with an | ||
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| ohmmeter for continuity. | ||
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| A. | If pressure switch contacts show | |
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| continuity (closed circuit) replace | |
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| the pressure switch. | |
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| B. | If pressure switch contacts show | |
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| open circuit and all wiring is correct | |
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| – replace the lower control. | |
8. | “IGN” Flashing | Open ignitor circuit | 1. Check all wiring to the hot surface ignitor. | ||
2. Check the 3 pin Molex ignitor assembly | |||||
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| plug and receptacle on the lower control | ||
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| for a good connection. Repair or replace | ||
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| parts if necessary. | ||
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| 3. Check resistance of the ignitor with an | ||
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| ohmmeter on the ignitor assembly plug. | ||
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| Replace ignitor if resistance is not within | ||
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| 1.72 and 2.40 ohms. | ||
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| 4. If above checks are good – turn off | ||
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| power for 10 seconds and then back on. | ||
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| If this error code will not clear and the | ||
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| ignitor resistance is within specifications | ||
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| – replace the lower control. | ||
9. |
| Flammable Vapor Sensor has | 1. Do not touch any electrical switch, do not use | ||
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| detected the presence of | any phone in the building and do not try to | ||
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| flammable vapors and is in lockout | light any appliance. | ||
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| 2. Smell around the water heater to ensure there | ||
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| are no gas leaks at the gas control valve or in | ||
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| the supply gas line or for any other type of | ||
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| flammable vapors in the area. | ||
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| 3. Carefully inspect the area surrounding the | ||
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| water heater for any substances such as gas- | ||
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| oline, paint, paint thinners, varnish, or cleaners | ||
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| that could emit flammable vapors. Remove | ||
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| anything that can potentially emit flammable | ||
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| vapors from the area and store it properly in a | ||
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| different location. | ||
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| ~ continued next page ~ | |
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