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360 DVS Series Direct Vent Fireplaces
10006326
NOTE:  Before troubleshooting the gas control system, be sure external gas shut off is in the “On” position.
SIT NOVA 820 MILLIVOLT VALVE
Troubleshooting the Gas Control System
WARNING:  REMOVE GLASS FRONT BEFORE DOING ANY GAS CONTROL SERVICE WORK.
   
SYMPTOM 
  POSSIBLE CAUSES 
 
CORRECTIVE ACTION
   1. Spark ignitor will not light 
A. Defective or misaligned  
Using a match, light pilot. If pilot lights, turn off  
 
     
  electrode at pilot. 
pilot and push the red button again. If pilot will not   
     
   
light, check the 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  
 
     
   
electrode and pilot. If no spark to pilot, and electode 
     
   
wire is properly connected, replace ignitor.
   2.  Pilot will not stay lit after 
A. Defective pilot generator 
Check pilot flame. Must impinge on thermocouple/ 
    carefully following lighting    (thermocouple), remote wall  
thermopile.  NOTE:  This pilot burner assembly   
      instructions. 
  switch. 
utilizes both a thermocouple and a thermopile.     
     
   
The thermocouple operates the main valve opera- 
     
   
tion (ON/ OFF). Clean and/or adjust pilot for maxi-  
     
   
mum flame impingement on thermopile and thermo- 
     
   
couple.
     
B. Defective automatic valve 
Turn valve knob to “Pilot.” Maintain flow to pilot;    
     
   
millivolt meter should read greater than 10 mV. If   
     
   
the reading is okay and the pilot does not stay on,  
     
   
replace the gas valve. NOTE:  An interrupter block  
     
   
(not supplied) must be used to conduct this test.
  3.  Pilot burning, no gas to 
A. Wall switch or wires defective 
Check wall switch and wires for proper connections 
    main burner 
   
Jumper wires across terminals at wall switch; if    
     
   
burner comes on, repalce defective wall switch. If  
     
   
okay, jumper wires across wall switch wires at valve;  
     
   
if burner comes on, wires are faulty or connections 
     
   
are bad.
     
B. Thermopile may not be 
1. Be sure wire connections from thermopile at    
     
  generating sufficient 
  gas valve terminals are tight and thermopile is  
     
  millivoltage. 
  fully inserted into pilot bracket.
     
   
2. One of the wall switch wires may be grounded.  
     
   
  Remove wall switch wires from valve terminals if  
     
   
  pilot now stays lit, trace wall switch wiring for    
     
   
  ground. May be grounded to fireplace or gas    
     
   
  supply.
     
   
3. Check thermopile with millivolt meter. Take  
 
     
   
  reading at thermopile terminals of gas valve—  
     
   
  should read 250-300 millivolts (minimum 150)   
     
   
  while holding valve knob depressed in pilot    
     
   
  position and wall 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  
Turn valve knob to “ON,” place wall switch to “ON” — 
     
  operator. 
millivolt meter should read greater than 100 mV. If  
     
   
the reading is okay and the burner does not come  
     
   
on, replace the gas valve.
  4.  Frequent pilot outage 
A. Pilot flame may be too low 
Clean and/or adjust pilot flame for maximum flame 
    problem. 
  or blowing (high) causing the 
impingement on thermopile and thermocouple.
     
  pilot safety to drop out.
     
B. Possible blockage of the vent 
Check the vent terminal for blockage (recycling the  
     
  terminal. 
flue gases)