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Use and Care Manual

ManualsBrandsAmerican Standard ManualsPlumbing10.0 GPM Residential Ultra Low Knox High Efficiency Condensing Natural Gas Tankless Water Heater with 180,000 BTU input
51525354555657585960
TANKLESS WATER HEATER
58
Error Code
Error Code Description Possible Remedies
Er:41 Fan Speed too High with Flame On Press the Power button to clear the Error Code. If Error happens again:
1. Check the vent connections for blockages.
2. Check the burner assembly.
3. Check fan operation. If fan appears to be operating normally but RPMs
are too low or too high, replace the fan.
4. If the problem persists, replace the main control.
Er:42 Jumped Wire Disconnected Press the Power button to clear the Error Code. If Error happens again:
1. Ensure the jumped wire is properly connected.
2. If the problem persists, replace the main control.
Er:43 Burner Overheat Switch Open Press the Power button to clear the Error Code.
If Error happens again:
1. Check burner overheat switch connections. Ensure connections are
secure.
2. Check switch resitance. If resistance is zero, replace the switch.
3. If the problem persists, replace the main control.
Er:61 Fan Speed Feedback Signal Abnormal This Error Code will go away when the condition is remedied. If Error
happens again:
1. Check the connections to the fan. Ensure all are secure.
2. If the fan does not rotate during the ignition sequence, check for 120V
power at the fan connection. If 120V power is present at the control, re-
place the fan. If the blower does not have 120V power, check power at the
control. If 120V power is not present at the control, replace the control.
3. If the problem persists, replace the main control.
Er:65 Supply Water Valve Error Press the Power button to clear the Error Code. If Error happens again:
1. Turn power OFF and ON at the main power switch internal to the water
heater.
2. Check wiring connections to supply water valve. Ensure all are secure.
3. Replace supply water valve.
4. If the problem persists, replace the main control.
Er:66 Mixing Valve Error Press the Power button to clear the Error Code. If Error happens again:
1. Turn power OFF and ON at the main power switch internal to the water
heater.
2. Check wiring connections to mixing valve. Ensure all are secure.
3. Replace mixing valve.
4. If the problem persists, replace the main control.
Er:67 AGM Error Press the Power button to clear the Error Code. If Error happens again:
1. Turn power OFF and ON at the main power switch internal to the water
heater.
2. Ensure fan inlet hole is completely open after turning the power OFF
and ON.
3. Check wiring connections to the AGM. Ensure all are secure.
4. Check AGM operation.
5. Replace AGM components.
6. If the problem persists, replace the main control.