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Electronic Control Troubleshooting
36. Will Not Run – Gas – Rotary Coin Drop
T088D
Single and stack with and
without time delay.
Is there voltage across
terminals 2A & 1A
of push to start
switch?
YES
NO
Replace push to
start switch.
Is there voltage across
COM and N.O. of
the airflow switch?
YES
Adjust the airflow
switch or replace if
inoperative.
NOTE: The N.O. contact is closed in
the rest position due to the physical
mounting of the switch.
NO
Is the unit equipped
with a time delay
board?
NO
Is there voltage across
H1-6 & H1-8 on
TMR1?
YES
Correct wiring to
TMR1.
NO
YES
Is there voltage across
DOB contacts (H1-4
and H1-5) on TMR2?
Replace time
delay board.
YES
NO
Is there voltage across
terminals H1-4 &
H1-8 on TMR2?
YES
NO
CONTINUED
ON NEXT
PAGE.
Is there voltage across
terminals 5 & 3 on
the CR2 relay?
Replace CR2
relay.
YES
Is there voltage across
terminals 7 & 8 of
CR2 relay?
NO
Correct wiring
between CR2
relay and
airflow switch.
NO
YES
Is there voltage across
coils B & A of the
motor control relay?
Correct wiring
between motor
control relay
and airflow
switch.
NO
**
**
**
Check for proper
operation of
airflow switch
and check wiring.
**
Is there voltage across
terminal 7 & 4 of the
motor control relay?
Replace motor
control relay.
YES
NO
**
**
** Tested with the start switch pressed in.
YES
Is there voltage at
terminal 5 on the
motor control relay?
Correct wiring
between
terminal 5
and supply
voltage.
NO
YES
**
** Tested with start switch
pressed in.
**
Is there voltage to
COM of the airflow
switch?
Correct wiring
between COM of
airflow switch and
1A on start switch.
YES
NO
Note: Reference
voltage to transformer
neutral.
T088D