Troubleshootin
g
Error Location Type Description
Cause Solution
Short circuit
in
heater wiring
.
Check wiring f
or 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.
Supply voltage
and/or frequency
fluctuation may
be affecting hose
current control.
Measure voltage and frequency
at system disconnect switch and
confirm they are stable.
A4DH Hose
High Current
Hose
Generato
rmay
be unders
ized
for combi
nation
of Reacto
r and
other su
pporting
equipme
nt.
Use continuous-run compressor with
head-unloader.
Turn off u
nnecessary loads
connecte
d to generator.
Software bug. A bug identified in software can
cause nuisance triggering of this
error, especially when running at high
pressure and low flow rates. Upgrade
system to the latest system software.
Short circuit of
motor wiring.
Check wiring to the motor to ensure
no bare wires are touching and that
no wires are shorted to ground.
Motor will not
rotate.
Remo
ve pump gear housings from
moto
r and check that motor shaft
rota
tes freely in direction indicated on
mot
or housing.
Damaged gear
train.
Check pump gear trains for damage
and repair or replace as necessary.
A4NM
MCM
High Motor
Current
Chemical pump
is stuck.
Re
pair or replace chemical pump.
A7DA Heater A Unexpected
Current A
S
horted TCM
I
f error cannot be cleared or
r
egenerates consistently, replace
m
odule.
A7DB Heater B Unexpected
Current B
Shorted TCM If error cannot be cleared or
regenerates consistently, replace
module.
A7DH Hose Unexpected
Current Hose
Shorted TCM If error cannot be cleared or
regenerates consistently, replace
module.
16 333024N
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