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14

Installation Instructions and Owner’s Manual

Unvented Natural Gas Vent Free Room Heaters

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 Piezo 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 control valve
7. Replace battery

ODS/pilot lights but flame 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 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. 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 and 12).

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 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.

 

Summary of Contents for MHVFR20TB NG

Page 1: ...m the room in which it is installed Provisions for adequate combustion and ventilation air must be provided Refer to Fresh Air for Combustion and Ventilation section on page 4 of this manual WARNING I...

Page 2: ...able material on or near the appliance Never place any objects on the heater Due to high temperatures heater should be kept out of traffic and away from furniture and draperies Surface of heater becom...

Page 3: ...eep all air openings in heater clear free of debris or any blockage This will insure that enough air for proper combustion enters the heater 4 If heater shuts off do not relight until you provide fres...

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

Page 5: ...hr 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 suppor...

Page 6: ...sible provide greater clearances from the floor ceil ing and joining walls WARNING Rework worksheet adding the space of the adjoining unconfined space The combined space must have enough fresh air to...

Page 7: ...r will be located Make sure mounting 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 pr...

Page 8: ...ng bottom mounting screw into wall stud drill holes at marked locations using 9 64 drill bit 5 Re place heater onto mounting bracket 6 Place spacers between bottom mounting holes and wall anchor or dr...

Page 9: ...binet Ground Joint Union Equipment Shutoff Valve From Gas Meter 4 W C to 10 5 W C Pressure Tee Joint 1 8 NPT Plug Tap Cap Pipe Nipple Tee Joint 3 8 NPT Pipe Nipple Sediment Trap Test Gauge Connection...

Page 10: ...our gas supplier call the fire department C Use only your hand to push in or turn the gas control knob Never use tools If knob will not push in or turn by hand don t try to repair it call a qualified...

Page 11: ...Heater may need more frequent cleaning due to excess lent from carpeting bedding material pet hair etc Make sure grille guard is in place before running heater If screen or grille guard is removed fo...

Page 12: ...acuum cleaner pressurized air or small soft bristled brush to clean CLEANING BURNER PILOT AIR HOLE INLET We recommend that you clean the unit ever 2 500 hours of operation or every three months We als...

Page 13: ...13 Installation Instructions and Owner s Manual Unvented Natural Gas Vent Free Room Heaters This page intentionally left blank...

Page 14: ...as 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...

Page 15: ...ances see 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...

Page 16: ...rough Friday Please include the model number date of purchase and description of problem in all communication LIMITED WARRANTY Mr Heater Inc warrants its heaters and accessories to be free from defect...

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