UGT Series Manual
35
Diagnostic Codes and Remedies
Code
Definition
Remedy
03
Power interruption during Bath
Fill (Water will not flow when
power returns).
Turn off all hot water taps. Press ON/OFF twice.
10
Air Supply or Exhaust Blockage
Check that nothing is blocking the flue inlet or exhaust.
Check all vent components for proper connections.
licensed
professional
only
Ensure approved venting materials are being used.
Ensure vent length is within limits.
Verify dip switches are set properly.
Check fan for blockage.
11
No Ignition
(heater not turning on)
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.
licensed
professional
only
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.
Ensure igniter is operational.
Check igniter wiring harness for damage.
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.
12
No Flame
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.
licensed
professional
only
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.
Check power supply for loose connections.
Check power supply for proper voltage and voltage drops.
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.
14
Thermal Fuse has activated
Check for restrictions in air flow around unit and vent terminal.
licensed
professional
only
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.
Check heat exchanger for cracks and/or separations.
Check heat exchanger surface for hot spots which indicate blockage due to scale
build-up. 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.
16
Over Temperature Warning
(safety shutdown because unit is
too hot)
Check for restrictions in air flow around unit and vent terminal.
licensed
professional
only
Check for low water flow in a circulating system causing short-cycling.
Check for foreign materials in combustion chamber and/or exhaust piping.
Check for blockage in the heat exchanger.
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.
WARNING
