Sure Heat FM35PHLP Patio Heater - Manual (Page 14)

Troubleshooting
14
BEFORE CALLING CUSTOMER SERVICE
If the heater does not function properly, use the following checklist.
And this condition exists:
Pilot won't light
NOTE: Heater operates at
reduced efficiency below
40 and 5 .
Cylinder valve is closed Open valve
Blockage in orifice or pilot tube Clean or replace orifice or pilot tube
Air in gas line
Open gas line and bleed it (pressing
control knob in) for not more than 1-2
minutes or until you smell gas
Low gas pressure with cylinder
valve fully open
Turn cylinder valve OFF and replace
cylinder
Igniter fails Use match to light pilot; obtain new
igniter and replace
Pilot won't stay lit
Dirt built up around pilot Clean dirt from around pilot
Connection between gas valve
and pilot assembly is loose
Tighten connection and perform leak
check
Thermocouple is not operating
correctly
Replace thermocouple
Burmer won't light
Gas pressure is low Turn cylinder valve OFF and replace
cylinder
Blockage in orifice Clear blockage
Control knob is not in ON
position
Turn control knob to ON
Burner flame is low
Gas pressure is low Turn cylinder valve OFF and replace
cylinder
Outdoor temperature is less
than 40 and tank is less
than 1/4 full
Use a full cylinder
Supply hose is bent or kinked Straighten hose
Control knob fully On
Check burner and orifices for
blockage
Carbon build-up Dirt or film on reflector and
burner screen
Clean reflector and burner screen
Thick black smoke Blockage in burner Remove blockage and clean burner
inside and outside
If the problem is: Then do this: