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5.3 TROUBLESHOOTING ‐ ERROR CODES
•
All tankless units are self diagnostic for safety and convenience when trouble shooting.
•
If there is a problem with the installation or the unit, it will display a numerical error code on
the Remote Controller (if installed), or on the 7‐Seg LED on the computer board to
communicate the source of the problem.
•
The 910 (T‐M50) is two units combined into one case. See the diagram below to determine
whether the problem is in the left or right side of the 910 (T‐M50).
•
Consult the following chart for the cause of each error code.
Figure 4 – Error Code Location
Table 2 – Error Codes
Error Code
031
101
111
121
311
321
331
391
441
510
551
611
631
651
661
681
701
721
741
761
991
7-Seg LED
Malfunction Description
Incorrect Dipswitch Settings
Warning for 991 Error Code
Ignition Failure
Output Thermistor
Inlet Thermistor
Mixing Thermistor
Air‐fuel Ratio Rod Failure
Flow Sensor (Easy‐Link, Multi‐Unit System only)
Abnormal Main Gas Valve
Abnormal Solenoid Gas Valve
Abnormal Fan Motor
Flow Adjustment Valve ( Easy‐Link, Multi‐Unit System only)
Bypass Valve Fault
External Fan Motor Failure
Computer Board Fault
False Flame Detection
Remote Controller Communication Failure
Communication Failure (Easy‐Link, Multi‐Unit System only)
Abnormal combustion
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The top red lamp will
flash when the right
combustion section has
an error code.
The mid red lamp will
flash when the left
combustion section has
an error code.
Flame Loss
Pump Failure
Troubleshooting Guide
Figure 5 – TM‐RE30
Remote Controller
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