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Note
DOMESTIC HOT WATER SENSOR: If the DHW sensor is shorted it will act as a closed thermostat and boiler will
continuously fire.
13 - TROUBLE SHOOTING
Troubleshooting Chart 1
E02 - Supply Sensor Short
E03 - Supply Sensor Open
E04 - Heat Exchanger Temp.
E05 - Heat Exchanger Temp.
E06 - Return Sensor Short
E07 - Return Sensor Open
E08 - Low Return Temp.
E09 -High Return Temp.
Locate Appropriate Sensor
See Figure 1 (page) and
Figure (Wire Diagram)
Trace wire leads. Are all
connections tight and wires
NO
Repair wire
and/or fix
connection.
Check sensor element is
properly installed in pipe.
Check sensor resistance
and compare to
temperature resistance
curve (Figure 13-1 page
88. (Remove sensor if
needed). OK?
YES
Replace
Control Board
undamaged?
YES
Check continuity across
YES
NO
YES
Re-Install
Sensor Properly
NO
Replace
Sensor
75
sensor.
OK?
NO
Replace
Sensor
P/N 240011656, Rev. E [07/30/2018]
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Table of Contents
Troubleshooting
