Electronic Ignition - MHSC 400BBVNV Installation & Operating Instructions Manual

TROUBLESHOOTING

ELECTRONIC IGNITION

START
1. T urn gas suppl y of f .
2. T urn O N /O F F sw itch to " O N "
P ow er to modul e ( 24V N ormal )
YES
I s th ere a spark across
ignitor sensor gap?
YES
T urn on gas.
D oes pil ot b urner l igh t?
YES
D oes spark stop w h en pil ot is l it?
YES
D oes main b urner l igh t?
YES
D oes sy stem run until O N /O F F sw itch
is in " O F F " position?
YES
END OF TROUBLESHOOTING
BBV, SBV Series Natural Vent Gas Fireplaces
C h eck : L ine v ol tage ( 120VA C )
NO
L ow v ol tage transf ormer ( 19. 5 minimum VA C )
O N /O F F sw itch
W iring connections
U npl ug ignition l ead and
NO
ch eck spark at modul e
( 24VA C normal ) .
I s spark O K ?
YES
A . C h eck ignition cab l e ground w iring, ceramic insul ator and gap.
Correct if necessary.
B. D oes ignition cab l e sh ow signs of mel ting or b uck l ing?
Take protective action to shield cable and boot from
excessive temperatures.
A . A re al l manual gas v al v es open?
NO
A re suppl y tub ing and pressure good?
A re pil ot b urner orifies b l ock ed?
B. C h eck el ectrical connections b etw een modul e and pil ot
operator on gas control .
C . C h eck f or 24VA C across P V- M VP V terminal s.
If voltage is correct, replace gas control.
If voltage is not correct, replace module.
NOTE: If Module goes into lockout, reset system.
NO
A . C h eck continuity of ignition cab l e and ground w ire.
B. C l ean flame rod.
C . C h eck el ectrical connections b etw een flame rod and modul e.
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 persists.
A . C h eck f or 24VA C across M V- M VP V terminal .
NO
Replace module if there is no voltage.
B. A re el ectrical connections b etw een modul e and gas
control good?
If connections are good, replace gas control or gas
control operator.
NO NOTE: If Module goes into lockout, reset system.
A . C h eck continuity of ignition cab l e and ground w ire.
NOTE: If ground is poor or erratic, shutdown may
occasionally occur even though operation is normal at
time of checkout.
B. Is pilot flame a steady blue? Does flame cover flame rod?
F P 2031
E l ectronic trb l sh t
R epl ace modul e
NO