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 18) 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.

Cleanburnerorifice(s)(seeClean-

ODS/pilot is lit

 

 

 

ing and Maintenance, page 18)

 

 

 

 

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.

Cleanburnerorifice(s)(seeClean-

 

 

 

 

ing and Maintenance, page 18)

 

 

 

 

or replace burner orifice(s)

 

 

 

 

Burner backfiring during com-

1. Burner orifice(s) is clogged or

1.

Cleanburnerorifice(s)(seeClean-

bustion

 

damaged

 

ing and Maintenance, page 18)

 

2.

Burner damaged

 

or replace burner orifice(s)

 

2.

Replace burner

 

3.

Gas regulator defective

3.

Replace gas regulator

 

 

 

 

Burner plaque(s) does not

1. Plaque damaged

1.

Replace burner

glow

2. Inlet gas pressure is too low

2.

Contact local natural or pro-

 

3.

Control knob set between

 

pane/LP gas company

 

3.

Turn control knob until it

 

 

locked positions

 

locks at desired setting

 

 

 

 

Slight smoke or odor during

1. Residues from manufacturing

1.

Problem will stop after a few

initial operation

 

processes

 

hours of operation

 

 

 

 

Heater produces a clicking/tick-

1. Metal expanding while heating

1.

This is common with most heat-

ing noise just after burner is lit

 

or contracting while cooling

 

ers. If noise is excessive, contact

or shut off

 

 

 

qualified service person

20

www.desatech.com

107883-01H

Page 20
Image 20
Desa CRN30 installation manual ODS/pilot lights but flame

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