5-7
TROUBLESHOOTING
TANKLESS WATER HEATER 199
F013
DHW inlet temperature sensor open/
short
•
Verify wire harness connections at DHW inlet
temperature sensor and control module are tight.
•
Check resistance of DHW inlet temperature sensor,
replace sensor if open/short circuit is found
•
Check resistance of DHW inlet temperature sensor at
control module harness connector, repair wire harness
if open/short circuit is found
F014
Heat exchanger temperature sensor
mounting fault.
•
Heat exchanger temperature is not changing while unit
is fired.
•
Verify heat exchanger temperature sensor is properly
mounted on the heat exchanger.
F015
High cabinet temperature
•
Check heat exchanger for flue gas leakage
•
Check vent pipe for flue gas leakage
F016
DHW outlet temperature sensor
mounting fault
•
DHW outlet temperature is not changing while unit is
fired
•
Verify DHW outlet temperature sensor is properly
mounted on the DHW outlet pipe
F017
DHW bypass valve fault
•
Verify wire harness connections at DHW bypass valve
and control module are tight
•
Check resistance of DHW bypass valve at control
module harness connector:
Green - Purple = 30 to 40 Ω
Green - Blue = 30 to 40 Ω
Green - Yellow = 30 to 40 Ω
Green - Orange = 30 to 40 Ω
Red - Black = 5.5 to 6.5 MΩ
Red - Brown = 17 to 21 MΩ
•
If any resistance value is outside of these ranges,
check and repair any wire harness open/short circuit
before replacing DHW bypass valve
F018
Flue/Combustion Air blockage.
•
Check the vent and combustion air pipes for blockage.
•
Verify operation of the backflow flapper in the fan
outlet.
F019
Boiler Memory Module (BMM) fault.
•
Verify wire harness connections at boiler memory
module and control module are tight.
•
Verify wire harness continuity between boiler memory
module and control module .
•
Replace boiler memory module.
F021
Critical parameter changed
•
Factory reset required
F028
Reset button fault
•
Check the reset button for unintentional operation (e.g.
cleaning of the control panel).
•
Replace the control module.
F029
Gas valve fault.
•
Verify wire harness connections at gas valve and
control module are tight
•
Replace gas valve if upper coil resistance is not 35 to
45 Ω.
•
Replace gas valve if lower coil resistance is not 20 to
30 Ω.
•
Check resistance of gas valve at control module
harness connector, repair wire harness if open/short
circuit is found or if resistance is not within 60 to 70 Ω
•
Replace control module.