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Troubleshooting
42. MM Models: No Heat With Cycle Selected, Unit Running and Calling For
Heat (continued)
120 Volt/60 Hertz/1 Phase and 208-240 Volt/60 Hertz/1 Phase Gas and Steam Nonreversing
208-240 Volt/60 Hertz/3 Phase and 480 Volt/60 Hertz/3 Phase Steam Reversing and
Nonreversing
Is there voltage
to terminal 3
of CR2?
TMB2169S-b
Is there 120 VAC
on terminal 3
of motor?
Correct wiring
between CR2
and motor.
Is there voltage
across gas
valve coils?
Check wiring.
Replace IEI
board if
necessary.
Is the igniter
sparking?
Check
resistance of
high voltage
lead (5k and
20k). Replace
if necessary.
No
Yes
No
Continued from
previous page
Is there voltage
to L1 of IEI
board?
Correct wiring
between IEI
board and CR2.
Replace
motor.
No
Yes
Yes
Is there gas flow
through the valve?
Check for proper
gas pressure.
Replace gas valve
if necessary.
Yes
No
Is there voltage
across the coil
of CR2?
Replace
CR2.
Unit
operational.
Yes
No
Is there voltage
across the coil of the
steam valve?
Correct wiring
to steam
valve.
Yes
Yes
No
Does the
unit heat?
Check for proper
steam
supply. Replace
steam valve if
necessary.
No
Yes
No
Yes
No
Содержание ATB50CG
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