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TROUBLESHOOTING GUIDE
Some of the checks below should be done by a licensed professional. Consumers should never attempt any action that they are not
qualified to perform.
Code
Definition
Power interruption during
03
Bath Fill (Water will not
flow when power returns).
05
Bypass servo
Air Supply or Exhaust
10
Blockage
No Ignition
11
(heater not turning on)
12
No Flame
14
Thermal Fuse has activated
Over Temperature Warning
16
(safety shutdown because
unit is too hot)
CAUTION
WARNING
DANGER
Remedy
AVERTISSEMENT
Turn off all hot water taps. Press ON/OFF twice.
ATTENTION
Contact a licensed professional.
Check that nothing is blocking the flue inlet or exhaust.
Check all vent components for proper connections.
Ensure approved venting materials are being used.
licensed
Ensure vent length is within limits.
professional
Verify dip switches are set properly.
Check fan for blockage.
only
Burner Sensor (see code 31)
Check that the gas is turned on at the water heater, gas meter, or cylinder.
If the system is propane, make sure that gas is in the tank.
Ensure appliance is properly grounded.
Ensure gas type and pressure is correct.
Ensure gas line, meter, and/or regulator is sized properly.
Bleed all air from gas lines.
Verify dip switches are set properly.
licensed
Ensure igniter is operational.
professional
Check igniter wiring harness for damage.
only
Check gas solenoid valves for open or short circuits.
Remove burner cover and ensure all burners are properly seated.
Remove burner plate and inspect burner surface for condensation or debris.
Check the ground wire for the PC board.
Check that the gas is turned on at the water heater, gas meter, or cylinder.
Check for obstructions in the flue outlet.
If the system is propane, make sure that gas is in the tank.
Ensure gas line, meter, and/or regulator is sized properly.
Ensure gas type and pressure is correct. Bleed all air from gas lines.
Ensure proper venting material was installed.
Ensure condensation collar was installed properly.
Ensure vent length is within limits. Verify dip switches are set properly.
licensed
Check power supply for loose connections.
professional
Check power supply for proper voltage and voltage drops.
only
Ensure flame rod wire is connected.
Check flame rod for carbon build-up.
Disconnect and reconnect all wiring harnesses on unit and PC board.
Check for DC shorts at components.
Check gas solenoid valves for open or short circuits.
Remove burner plate and inspect burner surface for condensation or debris.
Check for restrictions in air flow around unit and vent terminal.
Check gas type of unit and ensure it matches gas type being used.
Check for low water flow in a circulating system causing short-cycling.
Ensure dip switches are set to the proper position.
If switch #5 in the SW2 bank is in the OFF position, turn it to the ON position.
Check for foreign materials in combustion chamber and/or exhaust piping.
licensed
Check heat exchanger for cracks and/or separations.
professional
Check heat exchanger surface for hot spots which indicate blockage due to scale build-up.
only
Refer to instructions in manual for flushing heat exchanger.
Hard water must be treated to prevent scale build up or damage to the heat exchanger.
Measure resistance of safety circuit.
Ensure high fire and low fire manifold pressure is correct.
Check for improper conversion of product.
Check for restrictions in air flow around unit and vent terminal.
licensed
Check for low water flow in a circulating system causing short-cycling.
professional
Check for foreign materials in combustion chamber and/or exhaust piping.
Check for blockage in the heat exchanger.
only
44
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