Monessen Hearth PF User Manual

40

1.  Turn gas supply off.
2.  Turn ON/OFF switch to “ON”
  Power to module (24V Normal)

 

Is there a spark across 

 ignitor sensor gap?

 

Turn on gas. 

Does pilot burner light?

Does spark stop when pilot is lit?

Does main burner light?

Does system run until ON/OFF switch

 is in “OFF” position?

Check:  Line voltage (120VAC)
 

Low voltage transformer (19.5 minimum VAC)

 

ON/OFF switch

 

Wiring connections 

  Unplug ignition lead and 
  check spark at module   

 

 

(24VAC normal). 

 

Is spark OK? 

No  

Replace module

A. Check ignition cable ground wiring, ceramic insulator and 

gap. Correct if necessary.

B. Does ignition cable show signs of melting or buckling?  

A. Are all manual gas valves open?
  Are supply tubing and pressure good?
  Are pilot burner orifices blocked?
B. Check electrical connections between module and pilot 

operator on gas control.

C. Check for 24VAC across PV-MVPV terminals.
  If voltage is correct, replace gas control.
  If voltage is not correct, replace module. 

NOTE: If module goes into lockout, reset system.
A. Check continuity of ignition cable and ground wire.
B. Clean flame rod.
C. Check electrical connections between flame rod and 

module.

D. Is ceramic flame rod insulator cracked?
E. Is pilot flame a steady blue? Does flame cover flame rod?
  If not, adjust pilot flame. Replace module if problem 

A. Check for 24VAC across MV-MVPV terminal. 
  Replace module if there is no voltage. 
B. Are electrical connections between module and gas 

control good?  
If connections are good, replace gas control or gas 
control operator.

NOTE: If module goes into lockout, reset system.
A. Check continuity of ignition cable and ground wire.
  NOTE: If ground is poor or erratic, shutdown may 

B. Is pilot flame a steady blue? Does flame cover flame rod?
  If above checks out, replace module.