| TROUBLESHOOTING GUIDE |
Main power light is not lit. | Make sure that water heater is plugged in. |
| When the switch is on, is there 120VAC between L1 and N on the terminal block? If not, then |
| check for loose wire connections on the “Power Switch Wire Harness.” If connections are ok, then |
| replace the switch. |
| If there is voltage between L1 and N then the light on the switch is burnt out. Replace switch. |
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Thermostat does not call for heat. | Make sure that the temperature of the tank is cool. |
| If the thermostat does not call for heat, then check the PRIMARY voltage across the “Transformer”. |
| If there is voltage across the PRIMARY, then check the voltage across the SECONDARY leads of |
| the “Transformer”. |
| Install a jumper wire from N.O. terminal to the COM terminal on the “Thermostat PC Board.” If |
| the thermostat calls for heat after installing a jumper wire then check the “Thermostat Sensor |
| Probe” leads for proper resistance with an OHM meter (See appendix A). |
| If sensor reading are not correct, replace “Thermostat Sensor Probe.” |
| If the sensor readings are correct, then check “Potentiometer” for the proper resistance. If the |
| readings are correct, then replace the “Thermostat PC Board”, otherwise replace the |
| “Potentiometer.” |
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Ignition module “Power” LED is not lit. | Check for 120 VAC at the ignition module on “120 VAC IN.” If there is voltage, then replace the |
| ignition module. |
| If there is not any voltage, check the voltage across the transformer as previously described. |
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Blower does not energize. | Is the “Vacuum Switch” (air intake switch) N.C.? If no, then check the hose and see if it is filled |
| with condensate. If the hose is not filled with condensate, then replace vacuum switch. If filled, |
| empty hose. |
| Is the “Pressure Switch” (exhaust pressure switch) N.O.? If no, then check the hose and see if it |
| is filled with condensate. If the hose is not filled with condensate, then replace pressure switch. |
| If filled empty hose. |
| Is the “Collector Limit Switch” N.C.? If no, then reset switch. If this switch trips more than 3 |
| times, call service. |
| If all items above are ok, then replace the blower. |
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Ignitor does not glow. | Is there voltage to the “Hot Surface Ignitor”? Check for 120VAC to the ignitor from the ignition |
| module. |
| Is there continuity across the “Hot Surface Ignitor?” If no, then replace hot surface ignitor. If |
| yes, then replace the ignition module. |
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Main valve does not turn on. | Put your hand on the gas valve. When the “Valve” LED lights on the ignition module, can you |
| feel it energize? If not, then check the voltages at the ignition module across pins 2 and 7 on |
| the plug “CONTROL”. If there is 24 VAC across these pins, then check to see if the “Rectifier |
| Harness” is secure. If it is secure, then replace the “Gas Valve”. |
| If you can feel the gas valve energize, check the main gas supply is not in the off position. |
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Burner Flame keeps going out. | Is there minimum gas supplied to water heater as stated on the rating plate? If not, then |
| increase the supply pressure to the water heater. |
| Measure the microAmps through the flame sensor using a multimeter. Is there at least 4 |
| microAmps? If not, then replace the “Flame Sensor” or flame sensor wire. |
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Thermostat does not satisfy. | Is the tank temperature above the temperature set point? |
| Does the T&P relief valve leak? If yes, then replace “Thermostat PC Board.” |
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Blower did not post purge | Check “Vacuum Switch” (air intake switch) as previously mentioned. |
| Check “Pressure Switch” (exhaust pressure switch) as previously mentioned. |
| Check “Collector Limit Switch” as previously mentioned. |
| If above switches are all ok, then replace “Ignition Module.” |
2 0 | 9/07 Printed in USA |
