Turn off, or remove circulation pumps (unit is not designed for continuous

operation with circulation systems).

Clean combustion air fan.

Clean heat exchanger fins.

Check for adequate combustion air ventilation openings and clean if necessary.

Check vent system for partial blockage and correct as necessary.

Check that nothing is blocking the flue inlet or exhaust.

Ensure proper venting materials were used.

Ensure condensation collar was installed correctly.

Ensure heat exchanger fins, fan, and air intake are not blocked.

Ensure gas type and pressure is correct.

Bleed all air from gas lines.

Ensure gas line, meter, and regulator are sized properly.

Ensure appliance is properly grounded.

Check gas solenoid valves for open or short circuits.

Ensure igniter is operational.

Check igniter wiring harness for damage.

Ensure gas type and pressure is correct.

Bleed all air from gas lines.

Ensure flame rod wire is connected.

Check flame rod for carbon build-up.

Ensure gas line, meter, and regulator are sized properly.

Ensure appliance is properly grounded.

Check gas solenoid valves for open or short circuits.

Check power supply for loose connections.

Check power supply for proper voltage and voltage drops.

Disconnect remote control.

Disconnect and re-connect all wiring harnesses on unit and PC board.

Ensure proper venting material was installed.

Ensure condensation collar was installed properly.

Ensure maximum vertical vent length does not exceed allowable limits.

Ensure maximum horizontal vent length does not exceed allowable limits.

Check gas type of unit and ensure it matches gas type being used.

Check heat exchanger for cracks and/or separations.

Ohm out safety circuit.

Check for improper conversion of product.

Check for restrictions in air flow around unit and vent terminal.

Check for a foreign materials in combustion chamber and/or exhaust piping.

(must be fully open).

Check for clogged heat exchanger (scale buildup).

On commercial water heater, lower setpoint temperature below 180F at high

altitude.

Check for restrictions in air flow around unit and vent terminal.

Check for a foreign materials in combustion chamber and/or exhaust piping.

Make sure front panel is properly installed.

Press min button on PCB to reset.

Replace PCB

Ohm out sensor

Check and clean scale from sensor.

Replace sensor.

Ohm out sensor

Check and clean scale from sensor.

Replace sensor.

Temperature Sensor Fault

Ohm out solenoid valve.

terminals.

Ohm out solenoid valve.

restriction.)

Check wiring harness to motor for damaged and/or loose connections.

Ohm out motor winding.

Ohm out solenoid valve.

Replace PCB

Check inside burner chamber for any foreign material blocking flame at flame

rod.

Check all wiring to flame rod for damage.

Check flame rod for proper voltage.

Remove flame rod and check for carbon build-up, clean with sand paper.

Replace flame rod.

Bypass remote control cable by connecting remote control directly to remote

control terminals on PCB. Replace cable if found to be faulty.

Replace remote control.

Replace PCB.

restriction.)

Check fan motor for proper voltage.

Replace fan motor.

Replace PCB.

Check voltage of all flame rods.

Replace gas control valve.

flue.

Make sure power supply inlet fuses are not blown.

Clean inlet water supply filter.

Ensure you have at least the minimum flow rate required to fire unit.

Check for pipe dope inside water flow control turbine.

On new installations ensure hot and cold water lines are not crossed.

Check for bleed over. (Close cold water supply valve to water heater. Open hot

water taps at fixtures. If water flows steady from hot water taps, there is a bleed

over in the system.)