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13 - TROUBLE SHOOTING
Troubleshooting Chart 11
Start Boiler.
Is supply line warmer than
return line?
NO
YES
Assure wire harness
plugs are securely
connected to sensors
Replace Pump
E43
- No Water Temperature
Difference During Operation
Check wire plugs are
securely connected to
temperature sensors.
NO
YES
Onboard pump operating
properly?
NO
YES
Check both sensors
are properly inserted
into pipe lines.
NO
YES
Possible air in the
system. De-aerate.
NOT OK
OK
Done
Not OK
OK
Repair Sensor
Insertion Into
Pipe Lines.
Refer to Temperature
Sensor Chart (both
sensors)
Replace Sensor
Replace Control
Board
PN 240011656 REV. K [11/01/2020]