15
Code Description Remedy
14
Thermal Fuse has
activated
Check for restrictions in air flow around unit and exhaust outlet.
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 and programming parameters are set to the
proper 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 exhaust outlet.
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.
19
Electrical Grounding Check all components for electrical short.
21
Incorrect dipswitch
setting detected
Check dipswitch settings
32
Outgoing Water
Temperature Sensor
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
52
Modulating Solenoid
Valve Signal
Check modulating gas solenoid valve wiring harness for loose or
damaged terminals. Measure resistance of valve coil.
61
Combustion Fan
Ensure fan will turn freely.
Check wiring harness to motor.
Measure resistance of motor winding.
65
Water flow control
fault
Replace the Water flow control device.
70
PC Board Replace the PC Board.
71
Solenoid Valve
Circuit
Replace the PC Board.
72
Flame Sensing
Device
Verify flame rod is touching flame when unit fires.
Check all wiring to flame rod.
Remove flame rod and check for carbon build-up; clean with sand paper.
Check inside burner chamber for any foreign material blocking
flame at flame rod.
Measure micro amp output of sensor circuit with flame present.
Replace flame rod.
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