TROUBLESHOOTING

Continued

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

 

 

 

 

ODS/pilot lights but flame goes

1. Control knob not fully pressed

1.

Press in control knob fully

out when control knob is re-

 

in

2.

After ODS/pilot lights, keep

leased

2. Control knob not pressed in

 

control knob pressed in 30

 

 

long enough

 

seconds

 

3.

Safety interlock system has been

3.

Wait one minute for safety in-

 

 

triggered

 

terlock system to reset. Repeat

 

4.

Equipment shutoff valve not

 

ignition operation

 

4.

Fully open equipment shutoff

 

 

fully open

 

valve

 

5.

Thermocouple connection

5.

Hand tighten until snug, then

 

 

loose at control valve

 

tighten 1/4 turn more

 

6.

Pilot flame not touching ther-

6.

A) Contact local propane/LP or

 

 

mocouple, which allows ther-

 

natural gas company

 

 

mocouple to cool, causing

 

 

 

 

pilot flame to go out. This

 

B) Clean ODS/pilot (see

 

 

problem could be caused by

 

Cleaning and Maintenance,

 

 

one or both of the following:

 

page 22) or replace ODS/pilot

 

 

A) Low gas pressure

 

assembly

 

 

B) Dirty or partially clogged

 

 

 

 

ODS/pilot

 

 

 

7.

Thermocouple damaged

7.

Replace pilot assembly

 

8.

Control valve damaged

8.

Replace control valve

 

 

 

 

Burner does not light after ODS/

1. Burner orifice is clogged

1.

Clean burner (see Cleaning

pilot is lit

 

 

 

and Maintenance, page 22)

 

2.

Inlet gas pressure is too low

 

or replace burner orifice

 

2.

Contact local propane/LP or

 

 

 

 

natural gas company

 

 

 

 

Delayed ignition of burner

1. Manifold pressure is too low

1.

Contact local propane/LP or

 

2.

Burner orifice is clogged

 

natural gas company

 

2.

Clean burner (see Cleaning

 

 

 

 

and Maintenance, page 22)

 

 

 

 

or replace burner orifice

 

 

 

 

Burner backfiring during com-

1. Burner orifice is clogged or

1.

Clean burner (see Cleaning

bustion

 

damaged

 

and Maintenance, page 22)

 

2.

Burner damaged

 

or replace burner orifice

 

2.

Replace burner pressure

 

3.

Low inlet gas pressure

3.

Contact local propane/LP or

 

4.

Gas regulator defective

 

natural gas company

 

4.

Replace gas regulator

24

www.desatech.com

111044-01F

Page 24
Image 24
Desa HDCFTN ODS/pilot lights but flame goes, Press in control knob fully, Out when control knob is re, Triggered

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