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2700ES Tech Support
Problem Solving Error Codes
Q.
A2: Fault in the flue gas limiter
Q.
A3: Jumper connection is not correct.
Q.
A4: Backflow temperature sensor defect - happens if sensor is disconnected or short circuit.
Q.
A7: Outlet temperature sensor fault (Temperature below freezing or above 210ºF).
Q.
A9 (flashing): Outlet temperature sensor not sensing expected output temperature.
Q.
C6: Primary fan rotation too low on operation.
Q.
C7: No rotational speed sensor signal from primary fan.
Q.
CA (flashing): Water flow signal over specified maximum value. Water flow > 10 gallon/min.
Q.
E0: Internal hardware/software failure.
Q.
E1: Over-temperature detected by outlet temperature sensor on hot water pipe. Temperature > 185°F
Q.
E2: Cold water temperature sensor fault.
Q.
E4: Backflow temperature sensor over 309°F. The appliance will close the burner and lock.
Q.
E9: Overheat sensor (ECO) open circuit (should reset when cooler temperatures are detected).
Q.
EA: No flame ionization detected with water flow.
Q.
EC: Ionization failure during operation.
Q.
F7: Ionization error at standby.
Q.
FA: Gas leakage error, gas valve circuit not closing properly.
2700ES Tech Support
Troubleshooting
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Note: Specifications and product information subject to change without notice.