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Error
Code
Error Code
Description
Possible Remedies
Recover
methods
70
MCU self
diagnostics fault
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 appliance.
2. If the problem persists, contact technical support.
Soft Lock
72 Flame Signal Fault
This Error Code will go away when the condition is remedied. If Error happens again:
1. Check the appliance cover. Ensure it is secure. Flame detection sensor can detect an external light source.
2. Look thru boiler sight glass and check for glowing after burner shutdown. If you see glowing, do step 3.
3. Check burner plate by removing blower and boiler top plate and remove any debris from top of burner plate.
Debris can come from PCV shavings during intake installation and/or from nearby dryer vents and landscapers
causing debris being pulled in thru the air intake. Debris can glow after burner shutdown.
4. Check ame detection sensor. Ensure connections are secure. Normal operating settings are more than 2.5DC
before ignition, less than 2.5DC after ignition.
5. If the problem persists, contact technical support.
Soft Lock
76
Display to
main control
communication
fault
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 contact technical support.
Soft Lock
77
Outdoor sensor
error
This Error Code will go away when the condition is remedied. If Error happens again:
2. Check outdoor sensor resistance. If resistance is zero, replace the sensor.
3. If the problem persists, contact technical support.
Soft Lock
80
Internal low water
cut-off fault
This Error Code will go away when the condition is remedied. If Error happens again:
1. Ensure all valves are open to the appliance and there are no leaks.
2. Ensure all air has been purged from the system.
3. Check wiring connections to low water level sensor. Ensure all are secure.
4. Check low water level sensor resistance. If resistance is zero, replace the sensor.
5. If the problem persists, contact technical support.
Soft Lock
81
Internal low water
cut-off fault
This Error Code will go away when the condition is remedied. If Error happens again:
1. Ensure all valves are open to the appliance and there are no leaks.
2. Check wiring connections to low water level sensor. Ensure all are secure.
3. Check low water level sensor resistance. If resistance is zero, replace the sensor.
4. If the problem persists, contact technical support.
Soft Lock
85
Anti-freeze fault
(Appliance has
detected water
temperature below
34°F(1°C)
This Error Code will go away when the freezing condition is remedied. If Error happens again:
1. Ensure appliance is located in a mechanical room protected from freezing conditions.
2. Ensure all valves are open to the appliance, there are no leaks.
3. Check wiring connections to low water level sensor. Ensure all are secure.
4. Check low water level sensor resistance. If resistance is zero, replace the sensor.
5. If the problem persists, contact technical support.
Soft Lock
94
Exhaust gas
temperature fault
This Error Code will go away when the condition is remedied. If Error happens again:
1. Check if dip switch Max 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, contact technical support.
Soft Lock
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