TROUBLESHOOTING
TROUBLESHOOTING
On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models • 11
TROUBLESHOOTING
TROUBLESHOOTING
Error Codes
All units have self-diagnostics. If there is a problem with the unit, a numerical error code will display on the temperature controller
of indoor models or on the TM-RE42 Remote Controller (if installed). Installation related problems may also produce an error code.
If the remote/temperature controllers are not working, the green LED on the computer board will flash a code pattern. (The green
LED is located beside the DIP switches as shown in Figure 3)
Table 2: Error and Flash Codes
ERROR CODE
GREEN LED ON
COMPUTER BOARD
SYMPTOM OR ISSUE
031 One Flash Incorrect DIP switch
setting
.
101 Five Flashes Abnormal Combustion
(lockout is imminent)
.
111 or 121 Three Flashes Ignition failure / Loss of
flame
.
311 Two Flashes Outlet thermistor failure
(240/340 models)
Heat Exchanger
Thermistor Failure
(540 models)
NOTE:
If you are working with a water heater that is part of an Easy-Link or multi-unit system, we recommend that you
troubleshoot the unit as an individual unit and not as part of the system. Follow these steps prior to troubleshooting
a child unit: 1. Shut off power to the heater. 2. Close the isolation valves to the heater. 3. Disconnect both linking
wires from the bottom of the heater. 4. If the unit is not an end unit, take the ends of both linking wires which you
unplugged and connect them together. One end is male and the other is female; they will connect together.
5. Turn power to the heater back on, then troubleshoot as necessary.
Error code on the computer board
240 (T-H3J) and 340 (T-H3S) models
Green LED
540 (T-H3) model
Green LED
the temperature controller
Error code indicator on the remote
Figure 3
.
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