Troubleshooting
Guide
14|
Page
gas
meter.
b.
For
propane
units,
colder
periods
of
the
day
result
in
a
cold
regulator
and
may
cause
this
problem.
3)
Verify
that
the
gas
supply
pressure
is
within
specifications
when
the
heater
is
in
standby
and
when
the
heater
is
running.
4)
Check
that
the
clear
plastic
tube
connecting
the
proportional
gas
valve
to
the
combustion
chamber
is
attached.
5)
The
overheat
cutoff
fuse
(OHCF)
may
have
been
compromised.
For
procedures
on
how
to
check
whether
the
OHCF
is
intact,
refer
to
p.
24.
If
the
OHCF
has
been
compromised,
contact
the
Technical
Service
Department
for
further
assistance.
6)
If
flame
comes
on
for
only
1
‐
2
seconds
before
going
out,
clean
the
flame
sensor
(p.
25).
7)
Check
the
igniter
for
a
spark.
The
spark
may
be
viewed
through
the
sight
glass
located
next
to
the
igniter
and
flame
sensor.
a.
A
strong
blue
spark
will
remain
steady
and
in
place,
while
a
weak
spark
will
jump
around.
b.
If
no
spark
or
a
weak
spark
is
observed,
check
the
igniter
wire
connections
and
make
sure
these
are
secure.
If
these
are
secure,
a
replacement
igniter
will
be
required.
8)
Check
for
blockages
in
the
venting,
such
as
bird
nests,
animals,
or
trash.
a.
PC
Board
fault
or
Gas
Solenoid
fault.
Contact
the
Technical
Service
Department.
ERROR
CODE
121
[510
(T
‐
D2)],
THREE
FLASHES/12
[110
(T
‐
KJR2),
310
(T
‐
K4)]
FLAME
LOSS
This
error
code
appears
if
the
flames
disappear
while
the
unit
is
still
supposed
to
be
in
operation.
1)
Verify
that
the
hi
‐
limit
switch
is
not
tripped.
Turn
the
power
off
to
the
unit.
Push
the
white
button
in.
The
switch
will
reset
when
you
hear
and
feel
the
button
click.
Turn
the
power
back
on
and
test
the
heater.
If
the
unit
fires
on,
the
cause
of
the
hi
‐
limit
trip
must
be
determined.
Please
contact
the
Technical
Service
Department
for
further
technical
support.
2)
Check
the
gas
supply.
Verify
that
sufficient
gas
is
being
supplied
to
the
heater
and
the
gas
line
is
cleared
of
debris.
a.
It
is
possible
there
is
a
faulty
pressure
regulator
at
the
gas
meter.
b.
For
propane
units,
colder
periods
of
the
day
result
in
a
cold
regulator
and
may
cause
this
problem.
3)
Verify
that
the
gas
supply
pressure
is
within
specifications
when
the
heater
is
in
standby
and
when
the
heater
is
running.
4)
Check
that
the
clear
plastic
tube
connecting
the
proportional
gas
valve
to
the
combustion
chamber
is
attached.
5)
If
the
flame
comes
on
for
1
‐
2
seconds
but
then
goes
out,
clean
the
flame
sensor
(p.
25).
6)
The
overheat
cutoff
fuse
may
have
been
compromised.
For
procedures
on
how
to
check
whether
the
OHCF
is
intact,
refer
to
p.
24.
If
it
has,
contact
the
Technical
Service
Department
for
further
assistance.
7)
Check
for
blockages
in
venting,
such
as
bird
nests,
animals,
or
trash.
8)
PC
Board
fault
or
Gas
Solenoid
fault.
a.
If
one
of
these
is
suspected
to
be
the
problem,
contact
the
Technical
Service
Department.
Figure
7
