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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
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.”
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.
INTERNET VERSION FOR REFERENCE ONLY