SECTION XI: 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 |
|
| |
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 | |||
| REFERENCE |
|
| |
| 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 | .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.” |
|
| |
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. |
|
| |
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. |
| ||
|
|
| ||
Ignitor does not glow | Is there voltage to the “Hot Surface Ignitor”? | Check for | ||
| 120VAC to the ignitor from the ignition module. |
| ||
41