Troubleshooting - Mr. Heater Plaque MHVFR20TB LP Operating Instructions And Owner's Manual

Unvented lp-gas fired room heater
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TROUBLESHOOTING

NOTE: All troubleshooting items are listed in order of operation and likely occurrence.
WARNING: 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.
Make sure grille guard is in place before running heater. If screen or grille guard is removed for servicing it must be
replaced prior to operating the heater.
WARNING: If you smell gas:
Shut off gas supply
Do not try to light any appliance
Do not touch any electrical switch; do not use any phone in your building
Immediately call you gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
If you cannot reach your gas supplier, call the fire department.
IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning supplies, paint, paint remov-
er, cigarette smoke, cements and glues, new carpet or textiles, etc., create fumes. These fumes may mix with com-
bustion air and create odors and possible discoloration of walls and ceilings.
OBSERVED SYMPTOM
When ignitor button is pressed in, there is
no spark at pilot
ODS/pilot lights but flame goes out when
control knob is released
When ignitor button is pressed in, there is
a spark at the ODS/pilot but no ignition
Unvented LP-Gas Vent Free Room Heaters
POSSIBLE CAUSE
1. Ignitor electrode positioned wrong.
2. Ignitor electrode is broken.
3. Ignitor electrode not connected to
ignitor.
4. Ignitor cable pinched or wet.
5. Broken ignitor cable.
6. Bad Piezo ignitor.
7. Low Battery.
1. Gas supply turned off or equipment
shutoff valve closed.
2. Control knob not fully pressed in while
pressing ignition button.
3. Air in gas line when installed.
4. ODS/pilot is clogged.
5. Gas regulator setting is not correct
6. Control knob not in pilot position
7. Thermocouple connection loose at
control valve
8. 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
1. Control knob not fully pressed in.
2. Control knob not pressed in long
enough
3. Equipment shutoff valve not fully open
4. Thermocouple damaged
5. Control valve damaged
14
Installation Instructions and Owner's Manual
REMEDY
1. Reposition electrode
2. Replace electrode
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 control valve
7. Replace battery
1. Turn on gas supply turn off or open
equipment shutoff valve closed
2. Fully press in control knob while press-
ing ignition button
3. Continue holding down control knob.
Repeat ignition operation until air is
removed.
4. Clean ODS/pilot (see Cleaning and
Maintenance pages 11 and12).
5. Replace gas regulator
6. Turn Control knob to pilot position
1. Press in control knob fully
2. After ODS/pilot lights, keep control
knob pressed in for 30 seconds
3. Fully open equipment shutoff valve
4. Hand tighten thermocouple nut until
snug, and then tighten 1/4 turn more.
5. -
a. Contact local gas company
b. Clean ODS/pilot (see Cleaning and
Maintenance, pages 11 and 12).
6. Replace thermocouple
7. Replace Control valve.

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