Mr. Heater MHVFG30TB LP Operating Instructions And Owner's Manual page 14

Burner does not light after ODS/pilot is lit
Delayed ignition of burner
Burner backfi ring during operation
Burner plaque(s) does not glow [Infrared
Only]
Slight smoke or odor during initial opera-
tion
Heater produces a whistling noise when
burner is lit
White powder residue forming within
burner box or on adjacent walls or furni-
ture
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 win-
dows
1. Burner orifi ce is clogged
2. Burner orifi ce diameter to small
3. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifi ce is clogged
1. Burner orifi ce is clogged or damaged
2. Burner damaged
3. Gas regulator defective
1. Plaque damaged
2. Control knob set between locked posi-
tions.
3. Inlet gas pressure is too low
1. Residues from manufacturing process
1. Turning control knob to HI position
when burner is cold
2. Air in gas line
3. Air passageways on heater blocked
4. Dirty or partially clogged burner orifi ce.
1. When heated, vapors from furniture
polish, wax, carpet cleaners, etc., turn
into white powder residue
1. Heater burning vapors from paint, hair
spray, glues, etc. See IMPORTANT
statement on page 14.
2. Gas leak. See WARNING statement at
top of page 14.
1. Not enough fresh air is available
2. Low line pressure
3. ODS/pilot is partially clogged
1. Gas leak. See WARNING statement at
top of page 14.
2. Control valve is defective
1. Foreign matter between control valve
and burner
2. Gas leak. See WARNING statement at
top of page 14.
1. Metal expanding while heating or con-
tracting while cooling
1. Not enough combustion/ventilation air
Unvented LP-Gas Vent Free Heaters
1. Clean burner orifi ce (see Cleaning and
Maintenance on page 11), or replace
burner orifi ce
2. Replace burner orifi ce
3. Contact local gas company
1. Contact local gas company
2. Clean burner orifi ce (see Cleaning and
Maintenance on page 11), or replace
burner orifi ce
1. Clean burner orifi ce (see Cleaning and
Maintenance on pages 11 and 12), or
replace burner orifi ce
2. Replace burner
3. Replace gas regulator
1. Replace burner
2. Turn control knob until it locks at de-
sired setting.
3. Replace gas regulator
1. Problem will stop after a few hours of
operation
1. Turn control knob to LO position and
let warm up for a minute.
2. Operate burner until air is removed
from line have gas line checked by lo-
cal gas company.
3. Observe minimum installation clear-
ances (see Figure 4 page 7)
4. Clean burner orifi ce (see Cleaning and
Maintenance on pages 11 and 12), or
replace burner orifi ce.
1. Turn heater off when using furniture
polish, wax, carpet cleaner or similar
products.
1. Ventilate room. Stop using odor-caus-
ing products while heater is running.
2. Locate and correct all leaks (see
Checking Gas Connections, page 10)
1. Open window and/or door for
ventilation
2. Contact local gas company
3. Clean ODS/pilot (see Cleaning and
Maintenance, pages 11 and 12)
1. Locate and correct all leaks (see
Checking Gas Connections, page 10)
2. Replace control valve
1. Take apart gas tubing and remove
foreign matter
2. Locate and correct all leaks (see
Checking Gas Connections, page 10)
1. This is common with most heaters. If
noise is excessive, contact qualifi ed
service person
1. Refer to Fresh Air for Combustion and
Ventilation page 3 through 5.
14
Installation Instructions and Owner's Manual