Troubleshooting 73
5.1 Error Code List
Error Code
Sub
Code
Function Self-diagnostic/Action
E003 0 Ignition failure
* Check to see if the main gas supply valve is open.
* Verify that gas pressure is within operating range.
* Check gas system and orifice.
* Check Dual Venturi for proper operation.
* Check for proper dipswitch settings (see page 20).
* Tighten the ground connection screws on heat exchanger.
E004 0 FALSE flame detection
* Ensure ground wire is connected.
* Check the igniter for spark.
E012 0 Flame loss
* Check the main gas line (Is the valve open?).
* Verify gas pressure is within operating range.
* Check gas meter for proper BTU capacity.
* Check flame rod and verify [J] value in DIAGNOSTIC mode.
* Check intake air filter.
* Check ground wire.
* Check power supply.
* Tighten the ground connection screws on heat exchanger.
E016 0 Overheating of heat exchanger
* Clean the inlet water filter.
* Check High Limit Switch.
* Check for proper dipswitch settings (see page 20)
* Check the water adjustment valve.
* Check the heat exchanger; a flush may be necessary.
* Check pump operation (for A models only).
* Turn OFF the system for at least 30 minutes then restart.
E030 0
Exhaust Overheat: exhaust limit sensor shuts down
the unit when the flue temperature exceeds 230 °F
(110 °C) for more than 10 seconds.
* Turn OFF the system for at least 30 minutes then restart.
* Clean the inlet water filter.
* Check exhaust thermistor and verify [K] value in
DIAGNOSTIC mode.
* Check for proper dipswitch settings.
* Check the water adjustment valve.
* Check the heat exchanger; a flush may be necessary.
E047
1 Abnormal exhaust thermistor (open) * Check exhaust thermistor connection.
2 Abnormal exhaust thermistor (short) * Check for proper connection to the PCB.
E060
1 Abnormal Dual Venturi Limit Switch operation (ON) * Check the Dual Venturi connection.
2
Abnormal Dual Venturi Limit Switch operation
(Close OFF)
* Test Dual Venturi for proper operation using TEST mode.
3
Abnormal Dual Venturi Limit Switch operation
(Open ON)
* Check gas orifice for obstructions.
E109 0 Abnormal fan motor activity
* Check and clean the intake air filter.
* Verify proper voltage and wire connection.
* Check and clean the fan motor.
E110
1 Exhaust blockage (checking the FAN)
* Check the intake/exhaust/condensate drain pipe for
obstructions.(ice, snow, wildlife, etc)
2 Exhaust blockage (Using hot water) * Check and clean the intake air filter.
3 Exhaust blockage (using space heating)
* As a temporarily solution for troubleshooting purposes,
restart the unit and/or remove the front cover.
5. Troubleshooting
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