29
6.
“P-SW”, “OPEN”, and “CLEAN SCREEN” Flashing
The air pressure switch contacts
remain open longer than 11
seconds after the combustion fan
is energized
.
1
.
Clean the screen on the combustion air
intake chamber
.
Turn the power “OFF” for
10 to 20 seconds then “ON” again to clear
2
.
Ensure the pressure switch sensing tube
is in good condition and securel
y
connected at both ends
.
3
.
Ensure the inner door to the combustion
chamber is secure and the gasket is
properl
y
sealing
.
4
.
Check operation of the air intake chamber
A
.
Turn off power to the water heater
.
B
.
Remove the tubing from the pressure
switch and the wires from both
7.
“P-SW” and “SHORT” Flashing
The air pressure switch contacts
remain closed for more than 5
seconds when the
y
should be
open
.
1
.
Turn off power to the water heater
.
2
.
Locate the pressure switch wiring –
ensure pressure switch wiring is correct
and not jumped
.
3
.
Remove wires to both terminals on
pressure switch
.
4
.
Check pressure switch contacts with an
ohmmeter for continuit
y.
A
.
I
f pressure switch contacts show
continuit
y
(closed circuit) replace
the pressure switch
.
B
.
I
f pressure switch contacts show
open circuit and all wiring is correct
– replace the lower control
.
8.
“IGN” Flashing
Open ignitor circuit
1
.
Check all wiring to the hot surface ignitor
.
2
.
Check the 3 pin
M
olex ignitor assembl
y
plug and receptacle on the lower control
for a good connection
.
Repair or replace
parts if necessar
y.
3
.
Check resistance of the ignitor with an
ohmmeter on the ignitor assembl
y
plug
.
Replace ignitor if resistance is not within
1
.
72 and 2
.
40 ohms
.
4
.
I
f above checks are good – turn off
power for 10 seconds and then back on
.
I
f this error code will not clear and the
ignitor resistance is within specifications
– replace the lower control
.
9.
“FV-SENSE” Flashing
Flammable
V
apor Sensor has
detected the presence of
flammable vapors and is in lockout
1
.
Do not touch an
y
electrical switch, do not use
an
y
phone in the building and do not tr
y
to
CONTROL DISPLAY STATUS
PROBLEM
SOLUTION
the error code
.
I
f the problem persists:
fan and pressure switch
.
terminals of the pressure switch
.
C
.
Connect a digital manometer to the
open end of the tubing from the air
intake chamber
.
Turn on the power to
the water heater and when the fan turns
on, measure the pressure reading in the
tubing
.
I
f the pressure reading reaches
the
.
22” WC
make point
of the pressure
switch, turn off power to the water
heater and reconnect tubing to the
pressure switch
.
I
f pressure reading does
not reach the
.
22” WC
make point,
check
the s
y
stem and tubing for restrictions
and cleanliness
.
D
.
Attach leads of ohmmeter or continuit
y
tester to the terminals of the pressure
switch
.
Turn on power to the water
heater and when the air intake fan
comes on, check for continuit
y
across
the pressure switch contacts
.
I
f switch
contacts remain open (no continuit
y
)
while the fan is in operation - replace
the pressure switch
.
light an
y
appliance
.
2
.
Smell around the water heater to ensure there
are no gas leaks at the gas control valve or in
the suppl
y
gas line or for an
y
other t
y
pe of
flammable vapors in the area
.
3
.
Carefull
y
inspect the area surrounding the
water heater for an
y
substances such as gas-
oline, paint, paint thinners, varnish, or cleaners
that could emit flammable vapors
.
Remove
an
y
thing that can potentiall
y
emit flammable
vapors from the area and store it properl
y
in a
different location
.
~ continued next page ~
Summary of Contents for Gas Water Heater High Efficiency Atmospheric Vent
Page 34: ...34 NOTES ...
Page 35: ...35 NOTES ...