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Water Heater Error Codes

CODE: 35 
PROBLEM: Exhaust Sensor Open or Short 
FIX: 
This Error Code will go away when exhaust temperature decreases. 
If Error happens again: 
1. Check exhaust temperature sensor. Ensure connections are secure. 
2. Check sensor resistance. If resistance is zero, replace the sensor. 
3. Check exhaust vent for blockage. 
4. If the problem persists, replace the main control. 

CODE: 38 
PROBLEM: Error Appears When Control Stores Data, but Data is not Saved 
FIX:
Press the Power button to clear the Error Code. 
Replace the main control. 

CODE: 39 
PROBLEM: Flame Detected after Exiting a Flame On Condition 
FIX:
This Error Code will go away when the false flame condition is remedied. 
If Error happens again: 
1. Check the water heater cover. Ensure it is secure. Flame detection sensor can detect an external light source. 
2. Check flame detection sensor. Ensure connections are secure. Normal operating settings are more than 2.5DC before ignition, less than 2.5DC after ignition. 
3. If the problem persists, replace the main control. 

CODE: 41  
PROBLEM: Fan Speed too High with Flame On 
FIX:
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. 

CODE: 42 
PROBLEM: Flue APS – Closed is Normal, Open is Fault (Condensate Drain Trap) 
FIX:
Press the Power button to clear the Error Code. 
1. Check FLUE APS and main controller connections. Ensure all are secure. 
2. Check FLUE APS resistance. If resistance is zero, replace the switch. 
3. Check FLUE APS hose. Ensure it is connected and in good condition. 
4. Check exhaust vent for blockages. 
5. If the problem persists, replace the main control. 

CODE: 43  
PROBLEM: Burner Overheat Switch Open 
FIX:
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 resistance. If resistance is zero, replace the switch. 
3. If the problem persists, replace the main control. 

CODE: 45  
PROBLEM: Water Leak (150 Models ONLY) 
FIX:
1. Turn power off to water heater. 
2. Valve off the water heater to isolate it from the system. 
3. Call a qualified service technician to diagnose and repair the source of the leak. 

CODE: 61  
PROBLEM: Fan Speed Feedback Signal Abnormal 
FIX:
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, replace 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. 

CODE: 65  
PROBLEM: Supply Water Valve Error 
FIX:
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. 

CODE: 66  
PROBLEM: Mixing Valve Error 
FIX:
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. 

CODE: 67  
PROBLEM: AGM Error 
FIX:
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. 

CODE: 70 
PROBLEM: Register, Ram, Rom, I/O Port, AD Abnormal, Important EPROM Data or Safe Data Abnormal 
FIX:
This Error Code will go away when the condition is remedied. 
If Error happens again: 
1. Turn power OFF and ON at the main power switch internal to the water heater. 
2. If the problem persists, replace the main control. 

CODE: 72  
PROBLEM: Flame Signal Detected before Ignition 
FIX:
This Error Code will go away when the condition is remedied. 
If Error happens again: 
1. Check the water heater cover. Ensure it is secure. Flame detection sensor can detect an external light source. 
2. Check flame detection sensor. Ensure connections are secure. Normal operating settings are more than 2.5DC before ignition, less than 2.5DC after ignition. 
3. If the problem persists, replace the main control. 

CODE: 73  
PROBLEM: DIP Switch is abnormal 
FIX:
This Error Code will go away when the condition is remedied. 
If Error happens again: 
1. Check dip switches. Ensure switches match the ratings plate requirements of the water heater. See dip switch details, this manual, for default settings. 
2. If the problem persists, replace the main control. 

CODE: 76  
PROBLEM: Poor Communication 
FIX:
This Error Code will go away when the condition is remedied. 
If Error happens again: 
1. Check connections from main control to display panel. 
2. If the problem persists, replace the display and/or the main control. 

CODE: 78  
PROBLEM: Cascade Communication Error 
FIX:
NOTE: This error will only appear in a cascaded system. 
1. Turn power OFF and ON at the appliance display panel. 
2. If error reappears, ensure all cascaded appliances are powered ON. 
3. If error reappears, check Installer Mode parameter 13 at the Master appliance. Ensure the number of cascaded units chosen in this parameter matches the number of cascaded units in the system. 
4. If error reappears, check Installer Mode parameter 10 at all cascaded appliances. Ensure the address number matches that of the connected appliance (01 for Master, 02 for Follower 1, etc.) and that no numbers are skipped or repeated. 
5. Ensure every unit in the cascade system is connected properly. Inspect the cascade cables and ensure all are connected without damage or defect. Repair or replace any damaged cables. 
6. If the problem persists, replace the main control. 

CODE: 94 
PROBLEM: Exhaust NTC detects Vent Temperature is Greater than 149oF / 65oC 
FIX:
This Error Code will go away when the condition is remedied. 
If Error happens again: 
1. Check if dip switch High Fire setting is ON. Switches 6 and 7 should be OFF for normal operation. 
2. Check exhaust temperature sensor. Ensure connections are secure. 
3. Check sensor resistance. If resistance is zero, replace the sensor. 
4. Check exhaust vent for blockage. 
5. If the problem persists, replace the control. 
6. If the problem persists, replace the heat exchanger