Alto-Shaam Combitherm CT PROFORMANCE Series Service Manual

82
•
MN-35949
•
Rev 07
•
01/20
•
Combitherm® CT PROformance™ and CT Classic™ Series Technical Service Manual
Troubleshooting
PROformance and Classic Gas: No Combustion On A Call For Heat (ovens manufactured before
7/12/2019)
• All GAS troubleshooting trees based on a 7-20 120V 1PH model running at “ECO” power setting unless otherwise noted.
• The gas pressure to the appliance should be tested first to ensure that the connected pressure falls between the minimum/maximum
pressures called out in the installation manual for the appliance.
Is the combustion blower running?
Yes No
Replace
the
rectifier.
No
If this appliance
is 208/240V, is
there line voltage
entering and 120V
AC leaving the
rectifier?
Is 120V power supplied to the
combustion blower at its main
power connector?
No
Determine which leg of power is missing and
correct:
• L1 is supplied from terminalblock33-4
• L2/N is supplied from terminal12 of
the N7 high limit(reset the high limit
if is tripped) which is supplied from
terminalblock27-8
Yes
Yes
Is there 6-12 VDC across the
brown/black wires at the speed
cableof the combustion blower?
No
Test the speed cablefor continuity at each
wire. Replace and/or repair as needed.
Yes
Is the combustion blower
running?
No
Make sure the combustion blower motor is
free of obstruction. Replace the faulty motor
as needed.
Yes
Is the hall eect sensor of the
combustion blower sensing
motor rotation on white/black
wires on the speed cable?
No
Test the hall eect sensor wires for
continuity. Replace and/or repair the wiring
as needed.
Yes
Is there 120V across terminals 12 and 4 on the ignition
control?
No
Determine which leg of power is missing and
correct.
• Terminal12 is L1 and is supplied from
terminalblock33-2.
• Terminal4 is L2/N and is supplied from
terminal12 of the N7 high limit(reset
high limit if tripped) which is supplied
from terminalblock27-8.
Yes
Is there 120V across terminals 10 and 4 on the ignition
control?
No
Determine which leg of power is missing and
correct.
• Terminal4 is L1 and is supplied from
Control Board(CB) terminalX02pin2.
• Terminal4 is L2/N and is supplied from
terminal12 of the N7 high limit(reset
high limit if tripped) which is supplied
from terminalblock27-8.
Yes
Does the cold Ohm resistance read within the proper
range on igniter?
IG-36336: 8-15 Ohms
IG-37317: 30-60 Ohms
No
Replace the igniter.
Yes
Continued on next page

Alto-Shaam Combitherm CT PROFORMANCE Series Specifications

General

Brand	Alto-Shaam
Model	Combitherm CT PROFORMANCE Series
Category	Oven
Language	English