TROUBLESHOOTING

Continued

OBSERVED PROBLEM POSSIBLE CAUSE

REMEDY

ODS/pilot lights but flame goes out when control knob is re- leased

1.Control knob not fully pressed in

2.Control knob not pressed in long enough

3.Safety interlock system has been triggered

4.Equipment shutoff valve not fully open

5.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

6.Thermocouple connection loose at control valve

7.Thermocouple damaged

8.Control valve damaged

1.Press in control knob fully

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

3.Wait one minute for safety in- terlock system to reset. Repeat ignition operation

4.Fully open equipment shutoff valve

5.A) Contact local natural or propane/LP gas company

B)Clean ODS/pilot (see Cleaning and Maintenance, page 12) or replace ODS/ pilot assembly

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

7.Replace pilot assembly

8.Replace control valve

Burner does not light after ODS/

1. Inlet gas pressure is too low

1.

Contact local natural or

pilot is lit

2.

Burner orifice(s) clogged

 

propane/LP gas company

 

2.

Clean burner(s) (see Cleaning

 

 

 

 

 

and Maintenance, page 12) or

 

 

 

 

 

replace burner orifice(s)

 

3.

Remote selector in OFF

3.

Put remote selector in ON

 

 

position (Remote use only)

 

position

 

4.

Wire disconnected from gas

4.

See Wiring Diagram, page

 

 

control (Remote use only)

 

17)

 

 

 

 

Delayed ignition of burner

1. Manifold pressure is too

1.

Contact local natural or

 

 

low

 

 

propane/LP gas company

 

2.

Burner orifice(s) clogged

2.

Clean burner(s) (see Cleaning

 

 

 

 

 

and Maintenance, page 12)

 

 

 

 

Burner backfiring during com-

1. Burner orifice is clogged or

1.

Clean burner (see Cleaning

bustion

 

damaged

 

 

and Maintenance, page 12) or

 

 

 

 

 

replace burner orifice

 

2.

Damaged burner

 

2.

Replace damaged burner

 

3.

Gas appliance

regulator

3.

Replace gas regulator

 

 

defective

 

4.

Correct external gas regulator

 

4.

External gas

regulator

 

 

defective or set to incorrect

 

pressure or replace if

 

 

pressure

 

 

defective

14

www.desatech.com

114925-01C

Page 14
Image 14
Desa MPF18VNA Contact local natural or, Pilot is lit Burner orifices clogged Propane/LP gas company, Replace burner orifices

MPF18VNA, MPF24VPA, MPF18VPA specifications

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