Hey all you tech guys (and gals) especially anyone with RV appliance experience!!
Here's my story and a question at the end....
My 2008 Rockwood UltraLite TT has a Suburban NT20S furnace.
You can view a maintenance manual for it here-
Getting ready to go camping last weekend I flipped on the thermostat
to take the chill off while we were packing at home.
Blower came on immediately- normal
After a few seconds gas valve opened and spark ignited the burner- normal
Spark kept clicking for a few more seconds- NOT normal I think.
Gas valve shut- burner went off
Blower still running but no flame.
After about 10 seconds maybe 15 it starts again-
Gas valve opens
igniter keeps clicking even tho the burner is lit
after 5 seconds gas valve shuts
This repeats 3 times then stops-board has faulted apparently.
Blower continues to run for 2 or 3 minutes then shuts off.
IF I cycle the thermostat off and on the scenario starts again.
The burner is lighting successfully each time but the board doesn't
-know- it's lit.
After 3 tries it faults out.
OK now look at the manual- figure 18 on page 21.
That is my schematic.
Notice there is NO flame sensor shown.
Look at the electrode assembly figure 21 on page 22- That is NOT like
mine!! Mine has the spark gap and ground but there is NO flame sensor.
Look at figure 22- that is like my board- there is a high voltage wire to
the electrode but no other wire for any flame sensor probe.
Figure 22 also says that is a direct spark 3 try ignition which is what I have.
I think mine just doesn't have a flame sensor-- WHAT do you think???