No Heat

BLOWER RUNS BUT FAILS TO IGNITE



CONDITION

SOLUTION



•Low voltage
•12 volt polarity reversed
•Furnace grounding wires not secure
•Gas valve defective


•Gas pressure incorrect



•Limit switch defective or wire off
•Sail switch defective or wire off
•Burner orifice defective
•Combustion air wheel loose
•Burner head adjustment


•Exhaust blocked
•Air intake restricted
•Broken or loose wire
•Motor running slow


•Correct Power Supply
•Correct polarity
•Clean and secure grounds established
•Replace valve or valve coil, depending on problem encountered
•Set pressure to a minimum of 11"W.C. with all appliances running (Replace regulator if not obtainable)
•Reconnect wire or replace
•Reconnect wire or replace
•Clean main burner orifice or replace.
•Reposition and tighten
•Reposition and tighten
Adjust burner according to furnace specifications.
•Clean exhaust
•Clean air intake
•Replace or tighten
•Check voltage first
If 12 VDC while running, replace motor