Troubleshooting
Error Location Type Description
Cause Solution
Loose/broken
connection.
Check for loose wire
terminations at MCM motor
connector.
A1NM
MCM
Low Mo tor Current
Bad Motor. Disconnect motor output
connector from MCM.
Confirm less than 8 ohms
resistance between each
pair of motor power leads
(M1toM2,M1toM3,M2to
M3). If any readings greater
than 8 ohms, c heck motor
wiring for damage and/or
loose terminations.
Short circuit in
heater wiring.
Check wiring for touching
wires.
A4DA Heater A
High Current A
Bad Heater. Confirm resistan ce of
heater. Heater resistance
should be 18–21 Ω for
each heater element, 9–12
Ω combin ed for 10 kW
systems, and 6-8 Ω for
15 kW systems. If out of
tolerance, replace heater
element.
Short circuit in
heater wiring.
Check wiring for touching
wires.
A4DB Heater B
High Current B
Bad Heater.
Confirm resistance of
heater. Heater resistance
should be 9-12 Ω for 10
kW systems and 6-8 Ω for
15 kW systems. If out of
tolerance, replace heater.
Check continuity of
transformer windings.
Normal readings are ab out
0.2Ω on both primary and
secondary. If reading is 0Ω
replace transformer.
A4DH Hose
High Current Hose Short circuit in
hose wiring.
Check for shorts between
the primary winding and the
support frame or enclosure.
14
333024F
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