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Troubleshootin
g
Error
Code
Error
Location
Type Name
Cause Solution
Wiring problem.
Check wiring b
etween
HPTCM and cont
actor.
Look for short
ed wire
between HPTCM
and
contactor te
rminals A1
and A2.
A4CH
Hose ALARM High Relay
Current Hose
Shorted contactor.
Measure resi
stance
between A1 a
nd A2
terminals.
The resistance
should be ab
out 289Ω.
If contacto
r is measuring
less than 1
00Ω, then the
contactor
is shorted and
should be r
eplaced.
A4CM MCM
ALARM
High MCM
Current
MCM is drawing too
much current from the
system.
If problem continues
replace MCM. See system
repair manual.
Short circuit in booster
heater wiring.
Check wiring for touching
wires.
A4DA
A4DB
Boost A
Boost B
ALARM High Heater
Current
Bad heater.
Measure resistance of
heater(s), replace if
needed. See system
repair manual.
Check c
ontinuity of
trans
former windings,
norma
l reading are about
0.2Ω o
nbothprimaryand
secon
dary. If reading is
0Ω rep
lace transformer.
A4DH Hose ALARM High Heater
Current
Short c
ircuit in hose
wirin
g.
Check for shorts between
the primary winding and
the support frame of the
transformer.
3A1705J 75