Trouble Shooting Flow Chart (Furnaces Equipped With Tim E Delay Relay); Trouble Shooting Guide - Suburban DD-17DSI Service Manual

T herm ostat closes
Yes
A pproxim ately 10-20 seconds
B lower is operating
Yes
A fter 15 seconds the m odule
creates spark and opens valve.
Yes
S park occurs for approxim ately
7 seconds and m ain burner flam e
establishes.
Yes
T herm ostat opens and the tim e delay
operates the fan for the
cool down cycle.
Yes
S ystem O k

TROUBLE SHOOTING GUIDE

SUBURBAN RV FURNACES with TIME DELAY
12 VDC HEATING SECTION
C heck therm ostat wire connections,
-N o- contact points and the heat
C heck 12vdc at blue wire, check the
am p draw to therm ostat.
C heck for shorts.
C heck com ponents am perage.
C heck for 12vdc at furnace
C heck fuse or circuit breaker
C heck for 12vdc at tim e delay relay and
-N o-
for 12vdc to red wire leading to the m otor.
C h eck ground w ire on term inal block.
C heck for 12vdc between red and
-N o-
yellow wires at the m odule board.
C heck for 12vdc at lim it switch,
C heck for 12vdc at sail switch
N o spark at the electrode
-N o-
C heck for 12vdc at gas solenoid
D id the gas valve open.
C heck for restriction in
com bustion air Intak e (wasps, etc.)
Is flam e established.
-N o-
R eplace the tim e delay relay.
NOTE: On some models, sail switch is before limit switch.
-Yes-
anticipator.
N o
-Yes-
N o
-Yes-
Yes
-N o-
Yes
-N o-
Yes
-N o-
Yes
-N o-
-Yes-
N o
-Yes-
both sides.
N o
-Yes-
both sides.
-N o-
Yes
-N o-
valve.
Yes
-N o-
Yes
N o
-N o-
27
C lean points, secure loose
connections, replace therm ostat if
A nticipator is shorted.
R eplace therm ostat.
R epair or replace connections or parts
w ith higher than norm al am p d ra w.
C heck on/off switch on furnace
R eplace fuse/R eset breaker
R eplace the tim e delay relay.
R eplace the m otor.
C heck plug connection to the
m M odule-electrode and w ire-spark gap 1/8 inch
between probe and ground.
R eplace the sail switch.
R eplace the lim it switch.
R eplace the m odule.
R eplace the m odule.
C heck gas pressure at the m anifold or for
restrictions in the burner orifice.
N o
R eplace the gas valve.
C heck flam e contact to electrode. Flam e should
be hard blue.