Dutchwest Direct Vent / Natural Vent Gas Heater

Troubleshooting / Honeywell #8420 Gas Control System

NOTE: Before troubleshooting the gas control system, be sure the external gas shutoff is in the “ON” position.

WARNING: REMOVE THE GLASS PANEL BEFORE PERFORMING ANY GAS CONTROL SERVICE WORK.

SYMPTOM

POSSIBLE CAUSES

CORRECTIVE ACTION

1. Spark ignitor will not

A. Defective or misaligned elec-

Using a match, light pilot. If pilot lights, turn off pilot

light

trode at the pilot

and push the ignitor button again. If pilot will not light,

 

 

check gap at electrode and pilot - it should be 1/8” to

 

 

have a strong spark.

 

 

 

 

B. Defective ignitor (push button)

Push piezo ignitor button. Check for spark at elec-

 

 

trode and pilot. If there is no spark at the pilot, and

 

 

electrode wire is properly connected, replace ignitor.

 

 

 

 

A. Defective pilot generator (ther-

Check pilot flame. It must impinge on the thermo-

2. Pilot will not stay lit

mocouple)

couple or thermopile. NOTE: This pilot burner as-

after carefully fol-

 

sembly uses both a thermocouple and a thermopile.

lowing the lighting

 

The thermocouple operates the pilot flame. Tighten

instructions

 

the thermocouple. The thermopile operates the main

 

 

valve (ON and OFF). Clean and/or adjust pilot for

 

 

maximum flame impingement on thermocouple and

 

 

thermopile.

 

B. Defective automatic valve op-

Turn valve knob to ‘Pilot’. Maintain flow to pilot; mil-

 

erator

livolt meter should read greater than 10mV. If the

 

 

reading is okay and the pilot does not stay on, re-

 

 

place the gas valve. NOTE: An interrupter block (not

 

 

supplied) must be used to conduct this test.

 

 

 

3. Pilot lights, no gas to

A. Remote switch or wires defec-

Check rocker switch and wires for proper connection.

burner, valve knob

tive

Use jumper wires across terminals at rocker switch.

ON, remote switch

 

If burner lights, replace rocker switch. If okay, use

(rocker switch) ON

 

jumper wires across rocker switch wires at the valve;

 

 

if burner lights, wires are faulty or connections are

 

 

bad.

 

B. Thermopile may not generate

1. Be sure wire connections from thermopile at gas

 

sufficient voltage

valve terminals are tight and thermopile is fully

 

 

inserted into pilot bracket.

 

 

2. One of the rocker switch wires may be grounded.

 

 

Remove rocker switch wires from valve terminals.

 

 

If burner now stays lit, trace rocker switch wiring

 

 

from ground. It may be grounded to the appliance

 

 

or the gas supply line.

 

 

3. Check the thermopile with a millivolt meter. Take

 

 

reading at thermopile (“TP” and “TP/TH”) terminals

 

 

of gas valve. Should read 325 millivolts minimum

 

 

while holding valve knob depressed in PILOT po-

 

 

sition and with rocker switch OFF. Replace faulty

 

 

thermopile if reading is below specified minimum.

 

C. Plugged burner orifice

Check burner orifices for debris, and remove.

 

D. Defective automatic valve op-

Turn knob to ON, place rocker switch to ON, millivolt

 

erator

meter should read greater than 10 mV. If the read-

 

 

ing is okay and the burner does not light, replace the

 

 

valve.

4. Frequent pilot out-

A. Pilot flame may be too low or

Clean and/or adjust pilot flame for maximum flame

age

high, (blowing or lifting), caus-

impingement on thermocouple and thermopile.

 

ing the pilot to drop out

 

 

B. Possible blockage of the vent

Check the vent terminal for blockage.

 

terminal

 

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Vermont Casting 2465, 2466 Troubleshooting / Honeywell #8420 Gas Control System, Symptom Possible Causes Corrective Action

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