Table of Contents
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Check wire plugs are
securely connected to
temperature sensors.
NO
Assure wire harness
plugs are securely
connected to sensors
Repair Sensor
Insertion Into
Pipe Lines.
13 - TROUBLE SHOOTING
Troubleshooting Chart 11
E43 - No Water Temperature
Difference During Operation
Start Boiler.
Is supply line warmer than
return line?
YES
YES
Check both sensors
are properly inserted
into pipe lines.
NO
YES
Refer to Temperature
Sensor Chart (both
sensors)
OK
Replace Sensor
84
NO
Onboard pump operating
properly?
NO
YES
Possible air in the
system. De-aerate.
NOT OK
OK
Done
Not OK
Replace Control
Board
Replace Pump
P/N 240011656, Rev. E [07/30/2018]
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Table of Contents
Troubleshooting
