14
105736
VENT-FREE PROPANE/LP GAS HEATER
BLUE-FLAME MBP20LB
™
TROUBLESHOOTING
Note:
All troubleshooting items are listed
in order of operation.
WARNING: Turn off and
unplug heater and let cool be-
fore servicing. Only a qualified
service person should service
and repair heater.
CAUTION: Never use a wire,
needle, or similar object to clean
ODS/pilot. This can damage ODS/
pilot unit.
OBSERVED PROBLEM
When ignitor button is pressed, there is no
spark at ODS/pilot
When ignitor button is pressed, there is
spark at ODS/pilot but no ignition
ODS/pilot lights but flame goes out when
control knob is released
Burner does not light after ODS/pilot is lit
POSSIBLE CAUSE
1.
Ignitor electrode positioned wrong
2.
Ignitor electrode broken
3.
Ignitor electrode not connected to igni-
tor cable
4.
Ignitor cable pinched or wet
5.
Broken ignitor cable
6.
Bad piezo ignitor
1.
Gas supply turned off or equipment
shutoff valve closed
2.
Control knob not in PILOT position
3.
Control knob not pressed in while in
PILOT position
4.
Air in gas lines when installed
5.
Depleted gas supply
6.
ODS/pilot is clogged
7.
Gas regulator setting is not correct
1.
Control knob not fully pressed in
2.
Control knob not pressed in long enough
3.
Equipmentl shutoff valve not fully open
4.
Thermocouple connection loose at con-
trol valve
5.
Pilot flame not touching thermocouple,
which allows thermocouple to cool,
causing pilot flame to go out. This
problem could be caused by one or both
of the following:
A) Low gas pressure
B) Dirty or partially clogged ODS/pilot
6.
Thermocouple damaged
7.
Control valve damaged
1.
Burner orifice is clogged
2.
Burner orifice diameter is too small
3.
Inlet gas pressure is too low
REMEDY
1.
Replace ignitor
2.
Replace ignitor
3.
Reconnect ignitor cable
4.
Free ignitor cable if pinched by any
metal or tubing. Keep ignitor cable dry
5.
Replace ignitor cable
6.
Replace piezo ignitor
1.
Turn on gas supply or open equipment
shutoff valve
2.
Turn control knob to PILOT position
3.
Press in control knob while in PILOT
position
4.
Continue holding down control knob.
Repeat igniting operation until air is
removed
5.
Contact local propane/LP gas company
6.
Clean ODS/pilot (see Cleaning and
Maintenance, page 13) or replace ODS/
pilot assembly
7.
Replace gas regulator
1.
Press in control knob fully
2.
After ODS/pilot lights, keep control
knob pressed in 30 seconds
3.
Fully open equipment shutoff valve
4.
Hand tighten until snug, then tighten 1/4
turn more
5.
A) Contact local propane/LP gas
company
B) Clean ODS/pilot (see Cleaning and
Maintenance, page 13) or replace ODS/
pilot assembly
6.
Replace thermocouple
7.
Replace control valve
1.
Clean burner (see Cleaning and Main-
tenance, page 13) or replace burner
orifice
2.
Replace burner orifice
3.
Contact local propane/LP gas company
