Temco Tool 33TDVDSN - Manual (Page 25)

25
TDVDSN Series Direct Vent Gas Fireplace
20007890
Troubleshooting
NOTE: Before troubleshooting the gas control system, be sure external shut off is in the “ON” position.
WARNING: Before doing any gas control service work, remove glass front!
Problem Possible Cause Solution
No gas to main burner Low gas pressure to With the main burner functioning, adjust the inlet
the appliance. pressure regulator to supply gas to the appliance
within the design parameters of the appli-
ance manufacturer. (Typically
7”NG, 11”LPG)
Gas line valve not in ON position. Rotate OFF/ON gas line valve to the ON position.
Thermostat/wall switch Thermostat not in ON position. Turn thermostat ON, and adjust temperature
control to call for heat.
Defective thermostat or thermostat Replace thermostat or wiring.
wiring.
Thermostat/wall switch Defective wall switch. Repeat the above troubleshooting items covered
under will not cycle main “Defective ther-
mostat or thermostat wiring”, except substitute
the words “wall switch” where the word ther-
mostat appears in the instructions.
Excessive wire resistance. Make certain all connections are made using wire
of the proper size.
Valve wired wrong. Refer to wiring diagram on Page 25.
No spark when system is Check for 120V between black “hot” If 120V not present, check fuse or circuit breaker
turned to “ON” and reset line at control module and “white”
or repair wiring leading to fireplace.
cycle* has been return at module.
completed.
Spark for six (6) seconds a. Check that gas is turned on
Turn gas on and/or purge system.
at Ignitor, but no ignition system purged.
of burner.
b. Check that tips of ignitor are Position elecrodes so tips are directly above
directly above ports on main burner. burner ports and about 1/4” to 3/8” above
Spark is between electrodes and not burner.
from one electrode to burner
c. Check for 120V at each coil on the If 120V present, but gas valve does not click,
gas valve and listen for click replace gas valve.
indicating gas valve is opening.
Spark for six (6) seconds Check for clean ground path between Clean, position according to wiring diagram and
electrode bracket and fireplace repair defective electric connections. If all
chassis. Check wiring to wiring electrical connections are clean and correct,
diagram label. Check for broken replace module.
electrode on high-tension lead
attachment to module.
Main burner lights a. Check thermostat if applicable. Turn thermostat up to call for heat or replace.
normally and then goes
out.
b. Check high-tension lead and Replace spark electrode assembly.
connector for shorts.
*NOTE: Module DS2070S_A has a five (5) minute lockout timer: If burner does not light wait for five (5) minutes be-
fore attempting to relight.