Mr. Heater MHVFBF20 LPBT Operating Instructions And Owner'S Manual Download Page 13

Installation Instructions and Owner’s Manual

Unvented LP-Gas Vent Free Room Heaters

13

OBSERVED SYMPTOM 

POSSIBLE CAUSE

REMEDY 

When ignitor button is pressed in, there is 
no spark at pilot

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 ignitor.
7. Low Battery.

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 igniter assembly

7. Replace battery

ODS/pilot lights but fl ame goes out when 
control knob is released

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 fl ame not touching thermocouple, 

which allows thermocouple to cool, 
causing pilot fl ame 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. 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

When ignitor button is pressed in, there is 
a spark at the ODS/pilot but no ignition

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

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.

TROUBLESHOOTING

NOTE:

 All troubleshooting items are listed in order of operation and likely occurrence.

WARNING:

 Only a qualifi ed 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 fi re 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.

 

Summary of Contents for MHVFBF20 LPBT

Page 1: ...tallation adjustment alteration service or maintenance can cause injury or property damage Refer to this manual for correct installation and operational procedures For assistance or additional informa...

Page 2: ...IAL MEDIA WARNINGS IMPORTANT Read this owner s manual carefully and completely before trying to assemble operate or service this heater Improper use of this heater can cause serious injury or death fr...

Page 3: ...hr 2 931W shall not be installed in a bedroom or bathroom 3 Keep all air openings in heater clear free of debris or any blockage This will insure that enough air for proper combustion enters the heate...

Page 4: ...The following are excerpts from National Fuel Gas Code NFPA 54 ANSI Z223 1 Section 5 3 Air for Combustion and Ventilation All spaces in homes fall into one of the three following ventilation classific...

Page 5: ...Vent Free Heater 20 000 Btu hr Total 60 000 Btu hr 4 Compare the maximum Btu hr the space can support with the actual amount of Btu hr used Example 51 800 Btu hr maximum Btu hr the space can support...

Page 6: ...arances from the floor ceiling and joining walls WARNING Rework worksheet adding the space of the adjoining unconfined space The combined space must have enough fresh air to supply all ap pliance in b...

Page 7: ...bracket is level For wall stud mounting locate one end of the mounting bracket over a wall stud WARNING Maintain minimum clearances shown in figure 7 If you can provide greater clearances from the fl...

Page 8: ...tom mounting holes and wall anchor or drilled hole 7 Hold spacer in place with one hand With the other hand insert mounting screw through bottom mounting hole and spacer Place tip of screw in opening...

Page 9: ...g into heater If sediment trap is not installed or is installed improperly heater may not run correctly Pressure Regulator Heater Cabinet Ground Joint Union Equipment Shutoff Valve From regulated LP t...

Page 10: ...ny phone in your building Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you can not reach your gas supplier call the fire department C Use only y...

Page 11: ...a qualified service person of gas supplier for repairs If control knob does not pop up when released contact a qualified service person or gas sup plier for repairs 8 When the pilot is lit turn contr...

Page 12: ...e and pilot assembly clean and free of dust and dirt To clean these parts we recommend using compressed air no greater than 30 psig This can be done by using a vacuum cleaner in the blow position usin...

Page 13: ...gulator 6 Turn Control knob to pilot position When ignitor button is pressed in there is a spark at the ODS pilot but no ignition 1 Control knob not fully pressed in 2 Control knob not pressed in long...

Page 14: ...ee Figure 4 page 7 4 Clean burner orifice see Cleaning and Maintenance on pages 11 and 12 or replace burner orifice White powder residue forming within burner box or on adjacent walls or furni ture 1...

Page 15: ...Installation Instructions and Owner s Manual Unvented LP Gas Vent Free Room Heaters 15...

Page 16: ...w Thermocouple 1 23 801 10 Fan Assembly 1 9 80009 Orifice 1 24 80049 Fan Switch 1 10 80073 Orifice Adapter 1 25 8001 1 Ignitor Module Mounting Bracket 1 11 80056 Regulator Mounting Bracket 1 26 80019...

Page 17: ...ple 1 23 801 10 Fan Assembly 1 9 80009 Orifice 1 24 80049 Fan Switch 1 10 80073 Orifice Adapter 1 25 8001 1 Ignitor Module Mounting Bracket 1 11 80055 Regulator Mounting Bracket 1 26 80019 Ignitor Pul...

Page 18: ...1 7 80079 Gas Input Elbow Adapter 1 20 801 10 Fan Assembly 1 8 80107 Regulator 1 21 8001 1 Ignitor Module Mounting Bracket 1 9 80021 Regulator Connection 1 22 80019 Ignitor Pulse 1 10 80055 Regulator...

Page 19: ...1 7 80079 Gas Input Elbow Adapter 1 30 801 10 Fan Assembly 1 8 80083 Regulator 1 31 8001 1 Ignitor Module Mounting Bracket 1 9 80021 Regulator Connection 1 32 80019 Ignitor Pulse 1 10 80055 Regulator...

Page 20: ...DERING INFORMATION PURCHASING Accessories may be purchased at any Mr Heater local dealer or direct from the factory FOR INFORMATION REGARDING SERVICE Please call Toll Free 800 251 0001 www mrheater co...

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