Mr. Heater MHVFGH30LPT Operating Instructions And Owner's Manual page 14

OBSERVED SYMPTOM
Burner does not light after
ODS/pilot is lit
Delayed ignition of burner
Burner backfiring during
operation
Burner plaque(s) does not
glow [Infrared Only]
Slight smoke or odor
during initial operation
Heater produces a
whistling noise when
burner is lit
White powder residue
forming within burner box
or on adjacent walls or
furniture
Heater produces unwanted
odors.
Heater shuts off in use
(ODS operates)
Gas odor even when
control knob is in OFF
position
Gas odor during
combustion
Heater produces a clicking/
ticking noise just after
burner is lit or shut off
Moisture/condensation
noticed on windows
Unvented Liquid Propane Fired Room Heater
POSSIBLE CAUSE
Burner orifice is clogged
Burner orifice diameter to small
Inlet gas pressure is too low
Manifold pressure is too low
Burner orifice is clogged
Burner orifice is clogged or damaged
Burner damaged
Gas regulator defective
Plaque damaged
Control knob set between locked
positions.
Inlet gas pressure is too low
Residues from manufacturing process
Turning control knob to HI position when
burner is cold
Air in gas line
Air passageways on heater blocked
Dirty or partially clogged burner orifice.
When heated, vapors from furniture
polish, wax, carpet cleaners, etc., turn
into white powder residue
Heater burning vapors from paint,
hair spray, glues, etc. See IMPORTANT
statement on page 13
Gas leak. See WARNING statement at top
of page 13
Not enough fresh air is available
Low line pressure
ODS/pilot is partially clogged
Gas leak. See WARNING statement at top
of page 13
Control valve is defective
Foreign matter between control valve
and burner
Gas leak. See WARNING statement at top
of page 13
Metal expanding while heating or
contracting while cooling
Not enough combustion/ventilation air
REMEDY
Clean burner orifice (see Cleaning and Maintenance on page
11), or replace burner orifice
Replace burner orifice
Contact local gas company
Contact local gas company
Clean burner orifice (see Cleaning and Maintenance on page
11), or replace burner orifice
Clean burner orifice (see Cleaning and Maintenance on page
11), or replace burner orifice
Replace burner
Replace gas regulator
Replace burner
Turn control knob until it locks at desired setting.
Replace gas regulator
Problem will stop after a few hours of operation
Turn control knob to LO position and let warm up for a minute.
Operate burner until air is removed from line have gas line
checked by local gas company
Observe minimum installation clearances (see Figure 4 page 6)
Clean burner orifice (see Cleaning and Maintenance on page
11), or replace burner orifice
Turn heater off when using furniture polish, wax, carpet cleaner
or similar products
Ventilate room. Stop using odor-causing products while heater
is running.
Locate and correct all leaks (see Checking Gas Connections,
page 9)
Open window and/or door for ventilation
Contact local gas company
Clean ODS/pilot (see Cleaning and Maintenance, page 1 1)
Locate and correct all leaks (see Checking Gas Connections,
page 9)
Replace control valve
Take apart gas tubing and remove foreign matter
Locate and correct all leaks (see Checking Gas Connections,
page 9)
This is common with most heaters. If noise is excessive, contact
qualified service person
Refer to Fresh Air for Combustion and Ventilation page 3
through 5
14
Installation Instructions and Owner's Manual