TROUBLESHOOTING INSTRUCTIONS (cont’d)

PROBLEM

POSSIBLE CAUSE

 

SOLUTION

No gas to main

Gas pressure to appliance is

Refer to Item #2 in the Set-Up Guide.

burner.

low.

 

 

Thermostat or

Pilot not lit.

Light pilot and wait for thermopile to heat up sufficiently to power the main

wall switch will

 

operator. If pilot fails to light, or hold, refer to above sections.

not cycle main

Control knob not in ON

Rotate OFF/PILOT/ON control knob to the ON position.

burner

position.

 

 

 

Thermostat not in the ON

Turn thermostat to ON, and adjust temperature control to call for heat.

 

position.

 

 

 

Thermopile output voltage not

Refer to Item #7 in the Set-Up Guide. If unable to meet minimum

 

within design parameters.

thermopile requirements, replace thermopile.

 

Defective thermostat or

(A) With the pilot adjusted properly, (Refer to Item #7 in the Set-Up

 

thermostat wiring.

 

Guide) place a jumper wire between TPTH and TH. Measure the

 

 

 

voltage (millivolt) reading across the TPTH and TP terminals on

 

 

 

the control valve. This voltage should not fall below 300mV.

 

 

 

Record reading.

 

 

(B) Remove the jumper wire from the TPTH and TH connections and

 

 

 

reconnect the thermostat wires to the same terminals. Measure the

 

 

 

voltage (millivolt) reading across the TPTH and TP terminals on

 

 

 

the control valve. This voltage should not fall below 150mV. If

 

 

 

reading is below 150mV the source of excessive resistance must

 

 

 

be located and removed. (bad connections or bad wires)

 

Defective wall switch.

Repeat the troubleshooting items covered under “Defective thermostat or

 

 

thermostat wiring,” Use the exact same procedures but substitute the word

 

 

“wall switch” where the word thermostat appears.

 

Excessive wire resistance.

Make certain that all mV connections are made using wire of the proper

 

 

AWG size. (Refer to the Trouble-Shooting Guide.)

 

Valve wired wrong.

Thermopile leads must be connected to the TPTH and the TP connection of

 

 

the main control valve. Thermostat wires must be connected to the TPTH

 

 

and the TH terminals of the main control valve.

 

Main operator coil defective.

Verify the electrical resistance of the main control valve operator coil in the

 

 

following manner:

 

 

(A)

Remove all wires from the control valve head.

 

 

(B)

With an ohmmeter, measure the electrical resistance between TP

 

 

 

and TH terminals. If the resistance does not fall within

 

 

 

specifications shown in the Troubleshooting Guide, replace valve.

Main burner

Flue gas spillage present in

Check the appliances installation instructions provided by the manufacturer

cycles on and off.

combustion chamber. (Non-

to verify that the proper flue dimensions are within specification and that

System not on

DV appliances only)

proper combustion make-up air is provided for the particular appliance.

thermostat.

 

Verify that the appliance’s flue ins installed according to manufacturer’s

 

 

instructions.

 

 

Check the flue or the combustion air intake for blockage. Clean as

 

 

necessary.

Main burner lights

Debris or damage to seat of

Replace the control valve assembly.

in the PILOT

main valve.

 

 

position of the

Main seat blown out because

Replace the control valve assembly.

control valve.

of exposing LPG gas valve to

 

 

 

unregulated line pressure in

 

 

 

excess of 15 psig.

 

 

Version 1.0b

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