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DV425TR DIRECT VENT ROOM HEATER
02/01 Page 55 250-5533
TROUBLE SHOOTING (continued)
PROBLEM
Pilot will not Hold
(Cont.)
Pilot Drops Out.
No gas to Main
Burner
Thermostat/Wall
Switch will not
cycle the Main
Burner.
POSSIBLE CAUSE:
Defective Magnet
(mV Plus systems).
Defective Safety Magnet
(milliVolt System)
Pilot Orifice blocked.
Wrong Pilot Orifice.
Low gas pressure to
appliance.
Pilot not lit.
Control Knob in the "ON"
position.
Thermostat not in the "ON"
position.
Thermo-generator out-put
voltage not within design
parameters.
Defective Thermostat or
Thermostat Wiring.
Defective Wall Switch.
SOLUTIONS:
If the mV reading is above 6mV and the Safety Magnet does
not hold, replace the Valve.
(E) If closed-Circuit mV reading is the same as the Open-
Circuit reading, the Coil is electrically "Open". Replace the
Valve.
Verify operation of Safety Magnet in the following manner:
(A) Remove all Wires from the Terminals of the Main
Operator.
(B) Measure the electrical voltage between the Termihals
TPTH and TP. If the voltage is above 110mV and the Safety
Magnet does not hold, replace the Valve.
Replace Orifice with a new Orifice of the exact size and type.
Replace the Orifice with a new Orifice supplied specifically
for the appliance and gas in question.
Check Gas Pressure (&" NG/11"LP)
Light Pilot and wait for Thermo-generator to heat up
sufficiently to power the Main Operator. If Pilot fails to light,
hold, hold, refer to the above sections.
Rotate "OFF/PILOT/ON" Control Knob to the "ON" position.
Turn Thermostat "ON" and then adjust Temperature Control
to call for heat.
If unable to meet minimum requirements, replace the
Thermo-generator.
(A) With the apilot adjusted properly, place a Jumper Wire
between TPTH and TH. Take a mV reading across the TPTH
and TH Terminals of the Valve. This Closed Circuit voltage
should not fall below 300mV. Record reading.
(B) Remove Jumper wire from the TPTH and TH conections
and connect the Thermostat Wires to the same Terminals.
Closed Circuit voltage as described in the previous Step. If
the mFV reading drops below 150mV, excessive resistance
exists in the Thermostat Circuit and must be isolated and
eliminated.
Repeat the above troubleshooting items covered under
"Defective Thermostat or Thermostat Wiring" except,
substitute the words "Wall Switch" where the word
Thermostat appears in the instructions.