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5-5
TROUBLESHOOTING
TANKLESS WATER HEATER 199
5.3 FAULTS AND NOTIFICATIONS
5.3.1 Fault Codes
During operation the controller can detect unusual situations and can take action to avoid damage to the heat
exchanger or other unsafe operations. During these situations, the controller limits the temperature and power output
of the burner, or temporarily disables operation entirely.
These warnings are shown flashing and visible on the main display, and displayed only when an unusual reading is
currently detected. Fault Codes can be reset by touching the wrench for 2 seconds after the cause of the fault has
been resolved.
FAULT CODE DESCRIPTION POSSIBLE CAUSE / SOLUTION
F000 Heat exchanger temperature sensor
fault.
•
Verify wire harness connections at heat exchanger
temperature sensor and control module are tight.
•
Replace heat exchanger temperature sensor.
F002 High heat exchanger temperature during
DHW demand.
•
Verify the unit has been converted to propane if
operating on propane
•
Verify combustion readings at low and high fire are
within specifications.
•
Clean heat exchanger DHW coil.
•
Clean fire side of heat exchanger.
F003
High flue temperature.
•
Verify the unit has been converted to propane if
operating on propane.
•
Verify combustion readings at low and high fire are
within specifications.
•
Clean fire side of heat exchanger.
•
Clean heat exchanger central heating and DHW coils.
F004
No flame detected during four ignition
trials.
•
Verify external gas shutoff valve is open.
•
Verify gas inlet pressure is at least 4” during igntion
trial.
•
Verify condensate drain is not blocked.
•
Check vent and combustion air piping for blockage.
•
Verify internal and power supply grounding.
•
Verify ground spring is in contact with burner head
screw.
•
Verify ignitor to ignition module connection is tight.
•
Check ignitor condition and clean/replace as
necessary.
•
Verify operation of the backflow flapper in the fan
outlet.
•
Verify ignitor is not in contact with burner and gap is
correct.
•
Replace ignition module if unit lights but flame icon
doesn’t illuminate.
•
Replace ignition module if spark is not present and
110VAC is present on ignition module black and gray
wires.
•
Replace control module if spark is not present and
110VAC is not present on ignition module black and
gray wires.
•
Replace gas valve if gas inlet pressure does not drop
during trial for ignition and 24VDC is present at gas
valve harness.
•
Replace control module if gas inlet pressure does not
drop during trial for ignition and 24 VDC is not present
at gas valve harness.