Service Manual

41
41
Service Procedure IX:
Blocked Vent Switch Inspection and Replacement
Blocked Vent Switch Procedure
1. First determine if the blocked vent switch was
installed correctly on the drafthood (see image to
right).
2. When error code 67 is present on an ICON
Control Systems Model, or error code 26 is
present on an Integrated Control Model, you first
must determine if there is a blocked vent
condition present. If so, clear the obstruction and
reset the switch then continue with normal
operation.
3. If the switch is tripped and there is no obstruction
in the venting, there could have been an
extended down draft that tripped the switch. The
down draft could have been caused by damage
vent termination. Contact a plumbing professional
to correct this issue.
4. When no blockage or downdraft issues are present check the continuity of the switch (see image below). If
there is no continuity present, even when switch is reset, the blocked vent switch assembly needs to be
replaced.
5. If blocked vent switch assembly is functioning correctly, check to see if the wire harness has any signs of
damage. Replace harness if any signs of damage exist.
6. Restore water heater to use and confirm proper operation following the lighting instructions on the lighting
instruction label or the lighting instruction located in the Installation and Operating Instruction Manual.
.
Set voltmeter to Ohms,
the switch should be
very close to 0 Ohms
Blocked vent
switch should be
installed on the lip
of the drafthood