TROUBLESHOOTING

Continued

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

 

 

 

 

ODS/pilot lights but flame

1. Control knob not fully pressed in

1.

Press in control knob fully

goes out when control knob is

2. Control knob not pressed in

2. After ODS/pilot lights, keep con-

released

 

long enough

 

trol knob pressed in 30 seconds

 

3.

Equipment shutoff valve not

3.

Fully open equipment shutoff

 

 

fully open

 

valve

 

4.

Thermocouple connection

4.

Hand tighten until snug, then

 

 

loose at control valve

 

tighten 1/4 turn more

 

5.

Pilot flame not touching ther-

5.

A) Contact local natural or

 

 

mocouple, which allows ther-

 

propane/LP gas company

 

 

mocouple to cool, causing

 

B) Clean ODS/pilot (see

 

 

pilot flame to go out. This

 

Cleaning and Maintenance,

 

 

problem could be caused by

 

page 15) or replace ODS/pilot

 

 

one or both of the following:

 

assembly

 

 

A) Low gas pressure

 

 

 

 

B) Dirty or partially clogged

 

 

 

 

ODS/pilot

 

 

 

6.

Thermocouple damaged

6.

Replace pilot assembly

 

7.

Control valve damaged

7.

Replace control valve

 

8.

Safety interlock system has

8.

Wait one minute for safety in-

 

 

been triggered (thermostat

 

terlock system to reset. Repeat

 

 

models only)

 

ignition operation

 

 

 

 

Burner(s) does not light after

1. Burner orifice(s) is clogged

1.

Clean burner orifice(s) (see

ODS/pilot is lit

 

 

 

Cleaning and Maintenance,

 

 

 

 

page 15) or replace burner

 

 

 

 

orifice(s)

 

2.

Inlet gas pressure is too low

2.

Contact local natural or pro-

 

 

 

 

pane/LP gas company

 

 

 

 

Delayed ignition of burner(s)

1. Manifold pressure is too low

1.

Contact local natural or pro-

 

 

 

 

pane/LP gas company

 

2.

Burner orifice(s) is clogged

2.

Clean burner orifice(s) (see

 

 

 

 

Cleaning and Maintenance,

 

 

 

 

page 15) or replace burner

 

 

 

 

orifice(s)

 

 

 

 

Burner backfiring during com-

1. Burner orifice(s) is clogged or

1.

Clean burner orifice(s) (see

bustion

 

damaged

 

Cleaning and Maintenance,

 

 

 

 

page 15) or replace burner

 

 

 

 

orifice(s)

 

2.

Burner damaged

2.

Replace burner

 

3.

Gas regulator defective

3.

Replace gas regulator

116307-01A

www.desatech.com

17

Page 17
Image 17
Desa SF20NT ODS/pilot lights but flame, Press in control knob fully, Released Long enough, Contact local natural or

SF20NT specifications

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