E13
Installation instructions and Owner’s Manual
Model # HS25NG/LP
Table 4. Trouble Shooting Chart
Below in chart form are various symptoms of a malfunctioning system, possible defects that will cause these
symptoms and suggested corrective measures. The chart assumes that the proper gas pressure is available to the
heater and that the lighting procedure is as stated on the plate attached to the heater.
SYMPTOMS CAUSES
SOLUTIONS
burner light off very slow
partially block pilot orifice
replace
pilot out of adjustment
re-adjust pilot
burner light off very slow infra-red
partially blocked burner orifice
replace
color stays dull
burner flash back
low gas pressure
call your gas supplier
(roaring noise during operation
and ceramic grid surface will be
dark)
damaged burner
replace
ceramic grid or burner sooting up
first check for damaged burner
replace if damaged
(when new or after cleaning)
orifice
if burner orifice is not damaged
replace
then check for damaged manifold
pilot cannot be ignited
blocked pilot orifice
replace
gas cock not in position
gas cock knob must be
turned to pilot and held
depressed
pilot gas flow adjustment
open and adjust
screw may be closed
(see Figure 12)
pilot lights but goes out
defective thermocouple
replace
defective control
replace
pilot stays lit but main burner
loose wire or improperly wired
tighten connections, check
will
not
light
wiring
diagram
defective control
replace
blocked burner orifice
clean orifice or replace
failure to ignite
main gas off
open manual valves
air in gas line
bleed gas line
loose
wire
connections
tighten
wire
connections
dirty
wire
connections
clean
terminals
and
secure
terminals
3. REPLACING THE GAS VALVE UNIT
A. Remove the two gas valve unit wires at the gas
control valve labeled “PP”.
B. Unscrew gas valve from gas piping.
C. Reconnect gas valve and unit wires to terminals
“PP”. Be sure to leave thermostat wire on one
terminal.
4. FREQUENCY OF OPERATOR CHECKS
Intermittent use
. Appliances that are used seasonally
should be checked before shutdown and again before
the next use.
Dusty, wet or corrosive environment.
Since these
environments can cause the gas control to deteriorate
more rapidly, the system should be checked more often.
The gas control should be replaced if:
A. It does not perform properly on checkout or trouble
shooting.
B. The gas control knob Is hard to turn or push down,
or it fails to pop back up when released.
