MN-35949 • Rev 04 • 06/16 • Combitherm® CT PROformance™ Series • Technical Service Manual • 73
Troubleshooting
PROformance and Classic: Cleaning System is Not Operating
Is the Y4 cleaning pump being
energized at its timed cycle?
Is the Y4 cleaning pump
running?
Yes
Is there cleaning water at
the pump inlet?
Make sure the condensate pan
clean out hose is unplugged
and that the Y2 cooling water
solenoid is operating properly.
Is there cleaning water at the
water manifold inlet from the
Y4 pump?
Is there cleaning water at
the injection pipe?
Remove the obstruction
between the water manifold
and the injection pipe.
No
Yes
Is the injection pipe clear
of debris?
The cleaning pump and
plumbing circuit are
working properly.
Clean or replace the
injection pipe as needed.
No
Yes
No
Yes
No
Yes
Determine which leg of the
power is missing at the Y4
solenoid and correct.
A1 is L1 from the Control
Board (CB) terminal X03
pin 3.
A2 is L2 supplied from
the Control Board (CB)
terminal X03 pin 5 which
is supplied from the CB
terminal X03 pin 6.
No
Yes
Replace the
faulty cleaning
pump.
No
Inspect or replace the hose between
Y4 cleaning pump and the water
manifold. If the hose is okay, replace
the faulty Y4 cleaning pump.
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