90 • MN-35949 • Rev 04 • 06/16 • Combitherm® CT PROformance™ Series • Technical Service Manual
Troubleshooting
Error Code E94
Request E94 service kit (includes Interface Board (IB), Control Board (CB), Controller Area Network (CAN) cable, and Variable Frequency
Drive (VFD) and dispatch service agent.
Is the VFD version current?
20-10 and 20-20 models have
two (2) VFDs.
Still getting E94 error?
Still getting
E94 error?
Still getting
E94 error?
Still getting E94 error?
Still getting E94 error?
Still getting E94 error?
Still getting E94 error?
Still getting E94 error?
Disconnect both ends of the
current CAN cable, inspect
the terminals and firmly
reattach the CAN cable.
Replace the CAN cable.
Replace the CB.
Replace the IB.
Call Alto-Shaam Service.
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Disconnect the VFD
communication cable at the
CB terminal X16.
Replace the VFD(s) with
the current version.
If there is only one(1) VFD,
replace it. If there are two (2) VFDs,
reconnect X16 and continue.
Disconnect the VFD1
at VFD1 - S600.
Replace the current VFD with a
new VFD.
Replace the
VFD1.
Replace the
VFD2.
Reconnect the VFD1 at VFD1 -
S600. Disconnect the VFD2 at
VFD2 - S600.
Replace the dual VFD cable.
The appliance operates properly.
The appliance operates properly.
The appliance operates properly.
If not, restart at top of page.
The appliance operates properly.
The appliance should
operate properly.
Disconnect the IB to CB
CAN cable at the CB terminal X15.
No
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