OWNER’S MANUAL

TROUBLESHOOTING

Note: For additional help, visit DESA International’s technical service web site at www.desatech.com.

Note: All troubleshooting items are listed in order of operation.

WARNING: Turn off heater and let cool before servicing. 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.

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

When ignitor button is pressed, there is no spark at ODS/pilot

1.

Ignitor electrode not connected to igni-

1.

Reconnect ignitor cable

 

tor cable

 

 

2.

Ignitor cable pinched or wet

2.

Free ignitor cable if pinched by any

 

 

 

metal or tubing. Keep ignitor cable dry

3.

Broken ignitor cable

3.

Replace ignitor cable

4.

Bad piezo ignitor

4.

Replace piezo ignitor

5.

Ignitor electrode broken

5.

Replace piezo ignitor

6.

Ignitor electrode positioned wrong

6.

Replace piezo ignitor

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

1.Gas supply turned off or equipment shutoff valve closed

2.Control knob not in PILOT position

3.Control knob not pressed in while in PILOT position

4.Air in gas lines when installed

5.ODS/pilot is clogged

6.Gas regulator setting is not correct

1.Turn on gas supply or open equipment shutoff valve

2.Turn control knob to PILOT position

3.Press in control knob while in PILOT position

4.Continue holding down control knob. Re- peat igniting operation until air is removed

5.Clean ODS/pilot (see Cleaning and Maintenance, page 18) or replace ODS/ pilot assembly

6.Replace gas control

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

1.Control knob not fully pressed in

2.Control knob not pressed in long enough

3.Equipment shutoff valve not fully open

4.Pilot flame not touching thermocouple, which allows thermocouple to cool, causing pilot flame to go out. This prob- lem could be caused by one or both of the following:

A)Low gas pressure

B)Dirty or partially clogged OD S/pilot

5.Thermocouple connection loose at con- trol valve

6.Thermocouple damaged

7.Control valve damaged

1.Press in control knob fully

2.After ODS/pilot lights, keep control knob pressed in 30 seconds

3.Fully open equipment shutoff valve

4.A) Contact local natural gas company

B) Clean ODS/pilot (see Cleaning and Maintenance, page 18) or replace ODS/ pilot assembly

5.Hand tighten until snug, then tighten 1/4 turn more

6.Replace thermocouple

7.Replace control valve

Burner does not light after ODS/pilot is lit

1.

Burner orifice clogged

1.

Clean burner (see Cleaning and Mainte-

 

 

 

 

nance, page 18) or replace burner orifice

 

2.

Inlet gas pressure is too low

2.

Contact local natural gas company

 

3.

Burner orifice diameter is too small

3.

Replace burner orifice

 

4.

Thermopile leads disconnected or im-

4.

Reconnect leads (see Wiring Diagram,

 

 

properly connected

 

page 22)

 

5.

Burners will not come on in remote

5.

Replace battery in transmitter and

 

 

position

 

receiver

 

 

www.desatech.com

 

Continued

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For more information, visit www.desatech.com

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Desa MSVFBNR Series installation manual Troubleshooting, Observed Problem Possible Cause
Page 18 Page 20

MSVFBNR Series specifications

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