41
Service Procedure XI:
Vent Safety Switch Testing and Replacement
Error code 67 will display, indicating an open circuit for the vent safety switch. Determine if temperature has reached 190°F
before resetting switch and restoring operation. If evidence of extreme temperature is present, call Technical Support.
WARNING
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
Locate
grey
wires
(see image below).
N
Is there continuity through
grey
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).
Does the water heater
function?
Call
Technical
Support.
Replace vent safety
switch (see Vent
Safety Switch
Replacement
Procedure, pg 41).
Reset heater, observe heating
cycle. Does switch open?
Is the temperature over 190°F?
System O.K.
Does switch open prior
to 190°F?
DO NOT
operate heater. System over heating,
immediately contact Technical Support.
Replace vent safety switch (see
Vent Safety Switch Replacement
Procedure, pg 41).
N
N
Y
Y
Y
YY
N
N
N
YY
Y
Vent Safety Switch Location
Note:
Vent safety switch is labeled as
“Exhaust Limit Switch” in wiring diagram.
WARNING
Make sure exhaust collector compartment or exhaust
flue gases are not overheating (190°F) before
resetting vent safety switch. If there is evidence of
overheating, call Technical Support.
41
Содержание EF120T4003N3
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