Mastic 92P ユーザーズマニュアル

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TROUBLESHOOTING 

SYMPTOM 

POSSIBLE CAUSE 

ACTION

1.  Spark ignitor will not 

light pilot after repeated 
triggering of piezo.

 2.  Pilot will not stay lit 

after carefully following 
lighting instructions.

A.  Wire disconnected.

B.  Defective ignitor.

C.  No gas or low gas pressure.

D.  No Propane/LPG in tank

A.  Defective thermocouple

B.  Defective valve

A.  Open door and check to make sure wire is connected to ignitor.
B.   Check for spark at electrode and pilot. If no spark and electrode 

wire is properly connected, replace pilot assembly. 

C.  Check remote/manual shut off valve from fireplace. Low pressure 

can be caused by bent lines, restricted lines, low pressure line pres-
sure. Consult with plumber or gas supplier. 

D.  Check Propane/LPG tank. Refill tank.

A.  Check that thermocouple flame impinges on thermocouple. Clean 

and/or adjust pilot for maximum flame impingement. Ensure that 
the thermocouple connection at the gas valve is fully inserted and 
tight. 

 

Disconnect the thermocouple from the valve, place one millivolt 

lead wire on the tip of the thermocouple and the other meter lead 
wire on the thermocouple copper lead. Start the pilot and hold the 
valve knob in. If the millivolt reading is less than 15 mV, replace 
pilot assembly. 

B.   If thermocouple is producing more than 15 mV, replace 

faulty valve.

 TROUBLESHOOTING 

3.  Pilot burning, valve 

knob turned to “ON”, 
switch is turned to 
“ON” or “RS”, but 
burner will not ignite. 

4.  Frequent pilot outage 

problem. 

5.  The pilot and main 

burner extinguish while 
in operation 

A.  Defective switch, wall switch, 

remote control or wire

B.  Pilot flame too small

C.  Defective or malfunctioning 

thermopile

D.  Defective valve

A.  Pilot flame may be too high or 

too low, causing pilot safety to 
drop out 

A.  Inner vent pipe leaking exhaust 

gases back into system 

B.  Horizontal vent improperly 

pitched 

C.  Improper vent cap installation

A.  Check switch and wire for proper connection. Place jumper wires 

across terminals of switch. If burner comes on, replace defective 
switch.If the switch is OK, repeat the same procedure on remote 
control. If burner comes on, replace remote control. 

 

Place jumper wire across wire at gas valves (terminals marked TH 

and TP/TH). If burner comes on, wires are faulty or connections 
are bad. Replace wire.

B.   If pilot flame is not close enough to the thermopile, adjust 

pilot flame.

C.   Check thermopile wire connections to make sure all are tight and 

that the thermopile is fully inserted into pilot assembly. Check 
thermopile with a millivolt meter. Connect leads to TP and TP/
TH terminals on the control valve. If meter reading is below 325 
mV, replace pilot assembly.

D.   Turn valve knob to “O

N” and switch to “ON.” Take a reading at 

the thermopile leads (TP & TP/TH) on the valve. If the meter 
reads greater than 175 mV and the burner does not light, replace 
defective valve.

A.  Clean and adjust the pilot flame for maximum flame impingement 

on thermocouple.

A.  Check for flue product leak. Replace defective pipe section.

B.  Check horizontal-venting piping is running upward 1/4" per foot. 

Do not run the pipe level or downward. 

C.   Check for proper installation and freedom from debris or blockage.

 

 

 

 

 

 

6.  Flame burn blue and 

lifts off burner (ghost-
ing)

 

 

A.  Insufficient oxygen being supplied 

 

 

 
 

 

A.  Ensure that the vent cap is installed properly and free of debris. Ensure that 

the vent system joints are tight and have no leaks. Ensure that no debris has 
been blocking the inner air intake at the bottom back of the combustion 
chamber. Ensure that the glass is properly secure and 

latched

.