Blower Not Running Properly - Southbend CG90-1 Operator's Manual

T
ROUBLESHOOTING

Blower Not Running Properly

Disconnect 4-pin connector. Place fan switch in
"HIGH FAN" position. Locate the terminals
where Wires 21 and 55 are attached and check
for continuity between these terminals. Place
the fan switch in "LOW FAN" position. Locate
the terminals where Wires 22 and 56 are
attached. Check for continuity.
Is there
continuity in both
No
cases?
Replace
fan switch.
Check door switch actuator mechanism by
closing door and observing movement of door
switch lever. Adjust or repair as necessary.
Replace door switch as necessary.
P 30
AGE
Blower Not Running Properly (with Door Closed)
blower run when unit is
No
cold (door closed)?
Yes
Reconnect 4-pin connector.
Slide control panel out. Disconnect plug PL2.
Place test leads in terminals on switch side of plug.
Close door. Check for continuity.
Open door. Check for continuity.
Is there continuity with door closed
No
and no continuity with door open?
Does
Yes
Blower motor is overheating. Check operation
of cooling fan in control compartment and
replace as necessary.
Put fan switch in "LOW FAN" position.
TURN OFF GAS SHUT OFF VALVE.
Close door.
motor. Turn unit on. Check voltage between
Wires 25 and 8 by inserting test leads into the
harness side of plug PL8.
No
Replace control
board.
O ' M
PERATOR S ANUAL
C
OMBINATION
Yes
Disconnect 3-pin connector at
Is voltage
approximately
Yes
120 VAC?
Replace motor.
1180963
O
VEN