Monessen Hearth BBV400 User Manual

32

SYMPTOM
1.  Spark igniter 

will not light pi-
lot after repeat-
ed triggering of 
piezo.

2.  Pilot will not 

stay lit after 
carefully fol-
lowing lighting 
instructions.

3.  Pilot burning, 

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

4.  Frequent pilot 

outage prob-
lem.

5.  The pilot and 

main burner 
extinguish while 
in operation.

POSSIBLE CAUSE
A.  Wire disonnected.

B.  Defective igniter.

C. No gas or low gas 

pressure.

D. No Propane/LPG in 

tank.

A.  Defective thermocou-

ple.

B.  Defective valve.

A.  Defective switch, wall 

switch, remote control 
or wire.

B.  Pilot flame too small.

C. Defective or malfunc-

tioning thermopile.

D. Defective valve.

A.  Pilot flame may be too 

high or too low, caus-
ing pilot safety to drop 
out.

A.  Inner vent pipe leaking 

exhaust gases back 
into system.

B.  Horizontal vent improp-

erly pitched.

C. Improper vent cap 

installation.

ACTION
A.  Open door and check to make sure wire is connected to 

igniter.

B.  Check for spark at electrode and pilot. If no spark and elec-

trode 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 pressure. 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 mil-

livolt 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 15m V, replace pilot assembly.

B.  If thermocouple is producing more than 15m V, replace faulty 

valve.

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 proce-
dure on remote control. If burner comes on, replace remote 
control. Place jumper wire across wire at gas valves (termi-
nals 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 325m V, replace pilot assembly.

D. Turn valve knob to “ON” and switch to “ON”. Take a reading 

at the thermopile leads (TP & TP/TH) on the valve. If the me-
ter reads greater than 175m V and the burner does not light, 
replace defective valve.

A.  Clean and adjust the pilot flame for maximum flame impinge-

ment on thermocouple.

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

B.  Check horizontal-vent 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.