16 Troubleshooting

With proper installation, operation, and maintenance your gas appliance will provide years of trouble-free service. If you do experience a problem, this troubleshooting guide will assist a qualified technician in the diagnosis of a problem and the corrective action to be taken. This troubleshooting guide can only be used by a qualified technician. Contact your dealer to arrange a service call by a qualified technician.

A. Standing Pilot Ignition System

Symptom

Possible Causes

Corrective Action

1. After repeated triggering

A. No gas or low gas pressure.

Check the remote shut-off valves from the appliance. Usually, there

of the red or black piezo

 

is a valve near the gas main. There can be more than one valve

ignitor button, the spark

 

between the appliance and the main.

ignitor will not light the

 

 

B. No LP in tank.

Check the LP (propane) tank. You may be out of fuel.

pilot. Check for spark.

C. Ignitor.

Check the spark at the electrode and pilot. If no spark and

 

 

 

electrode wire is properly connected, replace the ignitor. Verify that

 

 

there is no short in electrode wire.

 

D. Pilot or misaligned electrode

Using match, light the pilot. If the pilot lights, turn off the pilot and

 

(spark at electrode).

trigger the piezo ignitor button again. If the pilot lights, an improper

 

 

gas/air mixture caused the bad lighting and a longer purge period

 

 

is recommended. If the pilot will not light, ensure the gap at the

 

 

electrode and pilot is one-eighth inch to have a strong spark. If the

 

 

gap is OK, replace the pilot.

 

 

 

2. The pilot will not stay lit

A. Thermocouple.

Check that the pilot flame impinges on the thermocouple. Adjust the

after carefully following the

 

pilot for proper flame impingement.

lighting instructions.

 

Ensure that the thermocouple connection at the gas valve is fully

 

 

 

 

inserted and tight (hand tighten plus 1/4 turn).

 

 

Verify proper voltage output from the thermocouple to the valve.

 

 

Place one millivolt meter lead wire on the thermocouple copper

 

 

lead. Place the second lead wire on the solder button on the back

 

 

of the valve (blue wire). Start the pilot and hold the valve knob in.

 

 

The millivolt reading should read 8-16 millivolts. If millivolt reading

 

 

is less than 8 millivolts, replace thermocouple.

 

 

 

 

B. Improper gas inlet pressure.

Natural gas should be 5-7 in. w.c. LP should be 11-14 in. w.c.

 

 

Verify pressure with manometer.

 

C. Valve.

If the thermocouple is producing 8-16 millivolts, replace control

 

 

valve.

3. The pilot is burning, there

A. On/off switch or wires

Check the ON/OFF switch and wires for proper connections. Place

is no burner flame, the

defective.

the jumper wires across the terminals at the ON/OFF switch. If the

valve knob is in the ON

 

burner comes on, replace the ON/OFF switch. If the switch is OK,

position, and the ON/OFF

 

place the jumper wires across the ON/OFF switch wires at the gas

switch is in the ON

 

valve. If the burner comes on, the wires are faulty or connections

position.

 

are bad.

 

 

 

 

B. Thermopile may not be

Check that the pilot flame impinges thermopile properly.

 

generating sufficient

 

 

Be sure the wire connections from the thermopile at the gas valve

 

millivoltage.

 

terminals are tight and that the thermopile is fully inserted into the

 

 

 

 

pilot bracket.

 

 

Check the thermopile with a millivolt meter. Take the reading at

 

 

TH-TP&TP terminals of the gas valve. The meter should read 350

 

 

millivolts minimum, while holding the valve knob depressed in

 

 

the pilot position, with the pilot lit, and the ON/OFF switch in the

 

 

OFF position. Replace the thermopile if the reading is below the

 

 

specified minimum.

 

 

 

 

 

With the pilot in the ON position, disconnect the thermopile leads

 

 

from the valve. Take a reading at the thermopile leads. The reading

 

 

should be 350 millivolts minimum. Replace the thermopile if the

 

 

reading is below the minimum.

Heatilator • Novus NDV Series • 4055-187 Rev. V • 1/12

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Hearth and Home Technologies 4055-187 owner manual Troubleshooting, Standing Pilot Ignition System
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