Troubleshooting – Desa VDCFTNB User Manual

Page 30

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116526-01B

30

POSSIBLe CAUSe

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 ther-

mocouple, which allows ther-

mocouple 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. Inlet gas pressure is too low

2. Burner orifice is clogged

3. Thermopile leads disconnected

or improperly connected (Re-

mote-Ready Models Only)

4. Burners will not come on in re-

mote position (Remote-Ready

Models Only)

1. Manifold pressure is too low

2. Burner orifice is clogged

1. Burner orifice is clogged or

damaged

2. Damaged burner

3. Gas regulator defective

4. Inlet gas pressure is too low

REMEDY

1. Press in control knob fully

2. After ODS/pilot lights, keep

control knob pressed in 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 27) or replace ODS/pilot

assembly

6. Hand tighten until snug, then

tighten 1/4 turn more

7. Replace pilot assembly

8. Replace control valve

1. Contact local natural or pro-

pane/LP gas company

2. Clean burner (see Cleaning

and Maintenance, page 27)

or replace burner orifice

3. Reconnect leads (see Wiring

Diagram, page 28)

4. Replace battery in transmitter

and receiver

1. Contact local natural or pro-

pane/LP gas company

2. Clean burner (see Cleaning

and Maintenance, page 27)

or replace burner orifice

1. Clean burner (see Cleaning

and Maintenance, page 27)

or replace burner orifice

2. Replace damaged burner

3. Replace gas regulator

4. Contact local natural or pro-

pane/LP gas company

OBSeRVeD PROBLeM

ODS/pilot lights but flame

goes out when control knob is

released

Burner does not light after

ODS/pilot is lit

Delayed ignition of burner

Burner backfiring during com-

bustion

TRoUBlEsHooTiNG

Continued

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