Service Manual

49
Service Procedure XI
Vent Safety Switch Testing and Replacement
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multimeter.
Sequence of Operation
Error code 67 will display indicating an open circuit for the vent safety switch. Determine if temperature has reached
350°F before resetting switch and restoring operation. If evidence of extreme temperature is present, call Technical
Support.
WARNING
Make sure the exhaust collector compartment is not
overheating (350°F) before resetting vent safety switch. If
there is evidence the collector compartment is
overheating, call Technical Support.
Locate harness connection
(see image at right).
Is there continuity through the
gray lead wires of heater side
harness? (see image below)
Depress reset
button on high
limit switch. Is
there continuity
across high limit
switch? (see
image below)
Replace vent
safety switch
(see Vent
Safety Switch
Replacement
Procedure,
pg 50).
Reset heater.
Observe the
heating cycle.
Does the
switch open?
Does the
heater
function?
Call Technical
Support.
System O.K.
Is temp over
350°F?
Does the switch
open prior to
350°F?
Replace vent safety
switch (see Vent
Safety
Switch Replacement
Procedure, pg 50).
DO NOT
OPERATE
HEATER!
System over
heating,
immediately
contact
Technical
Support.
Y
Y
Y
Y
Y
Y
N
N
N
N
N
Reset Button
49