59
LP-542 REV. 6.2.16
Er:41
Fan Speed too High
with Flame On
The Error Code will go away unless it occurs five (5) times in ten (10) minutes. 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
Low Water Cutoff
(LWC) Circuit is Open
Press the Power button to clear the Error Code.
If Error happens again:
1. Ensure that the LWC jumper is installed if low water cut off is not in use.
2. Ensure that the LWC wires are properly installed (if in use).
3. Ensure that the LWC ground wire is properly grounded.
4. 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 resistance. If resistance is not zero, replace the switch.
3. If the problem persists, replace the main control.
NOTE:
During the error state, the fan will operate to cool the burner until the switch closes.
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 AC8V~26.5V power at the fan
connection. If AC8V~26.5V power is present at the control, replace the fan. If the blower does not have
AC8V~26.5V power, check power at the control. If AC8V~26.5V power is not present at the control,
replace the control.
3. If the problem persists, replace the main control.
Er:70
Register, Ram, Rom,
I/O Port, AD Abnormal,
Important EPROM
Data or Safe Data
Abnormal
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 boiler.
2. If the problem persists, replace the main control.
Er:72
Flame Signal Detected
before Ignition
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check the boiler 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.
Er:76
Poor Communication
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check connections from main control to display panel (error occurs if there is no communication for 10
minutes).
2. If the problem persists, replace the display and/or the main control.
Er:78
Cascade
Communication Error
NOTE:
This error will only appear in a cascaded system.
1. Turn power OFF and ON at the boiler display panel.
2. If error reappears, ensure all cascaded boilers are powered ON.
3. If error reappears, check Installer Mode parameter 28 at the Master boiler. 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 27 at all cascaded boilers. Ensure the address
number matches that of the connected boiler (00 for Master, 01 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.
Er:80
Low Water Level
Sensor
(Low Water Level
Detected Four (4)
Consecutive times)
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Ensure all valves are open to the boiler 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, replace the main control.
Er:81
Low Water Level
Circuit
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Ensure the system is filled with water. Ensure all valves are open to the boiler 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, replace the main control.
