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Notice:
The intake pressure switch is not used
on serial number "CF" and later.
N
Does Blower Energize?
Y
See "Vent Safety Switch Testing
Exhaust Pressure Switch Tesinting
"Blower Testing and Replacement"
Does purge LED
Y
illuminate on the ignition
module?
N
With manometer, take a
reading from the inlet tube
N
pressure tap. Is reading
negative (-)1.2" W.C.
or more?
(see illustration below)
Y
Remove hose from intake
pressure switch and
Restart heater.
Does purge LED illuminate?
N
Isolate (disconnect) heater from
intake vent system and
Restart heater.
Does purge LED illuminate?
Y
Is intake vent system
Y
obstructed?
N
Call for technical support.
Used on EF water heaters prior to "CF" serial number.
Is there continuity
through the normally
N
closed intake pressure
switch?
(see photo at right)
Y
and Replacement"
or
and Replacement"
or
Switch OK.
Is there continuity
through the normally
Y
closed intake pressure
switch?
(see photo above)
N
See "Exhaust Pressure Switch Testing
Y
and Replacement")
or
"Blower Testing and Replacement"
N
Clear obstruction.
WARNING
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
Replace
intake pressure switch.
(see "Intake Pressure Switch
Replacement Procedure")
Disconnect red wire leads from
Inlet Tube
pressure tap
pressure switch and check
continuity through switch.
69
69
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