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Troubleshooting
51. CD Models: No Heat With Vend Satisfied and Unit Running (continued)
120 Volt/60 Hertz/1 Phase and 240 Volt/60 Hertz/1 Phase Gas Nonreversing Models
Is
there voltage
to the output side
of the adjustable
thermostat?
TMB2178S-b
Does the
igniter spark?
Check for proper gap on
igniter and check for proper
resistance of high voltage
lead. Replace lead if
necessary. (Proper gaps
for igniter are 5/16 above
burner and 5/32 between
electrode and grounding
tab. The proper resistance
of the high voltage lead
is between 5,000 Ohms
and 25,000 Ohms.)
Is there voltage
across V1 and V2
of the IEI board?
Replace
IEI board.
No
Yes
No
Continued from
previous page
Is there
voltage to L1 of the
ignition control board
(IEI board)?
Correct wiring
between
ignition control
board and
thermostat.
No
Yes
Replace
thermostat.
No
Yes
Is there voltage
across the coils of
the gas valve?
Is there
gas pressure on the
output side of the
gas valve?
Replace
gas valve.
Check for proper gas
pressure. 3.5 water
column inches for
Natural Gas, 10.5
water column inches
for L.P. Gas.
No
Yes
Is there
a flame?
Unit is
operational.
Yes
No
No
Yes
Correct wiring
between gas
valve and IEI
board.
Yes
Содержание ATB50CG
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