Pilot Model - Atwood 79 Series Service Manual

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FURNACE - Pilot Model (continued)
CAUSE
BLOWER SHUTS OFF AT SAME TIME BURNER SHUTS OFF
Faulty relay
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Thermostat wired wrong
BURNER FAILS TO IGNITE AND - BLOWER FAILS TO RUN
No electrical power to the furnace
BLOWER VIBRATES OR IS NOISY
Damaged blower wheel
Motor shaft bent
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Loose motor
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Restricted discharge duct system
requirements.*
PILOT FAILS TO IGNITE OR STAY LIT
Plugged pilot orifice
Electrode out of adjustment
Pilot tube defective
Piezo sparker defective
Defective thermocouple
Defective valve
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Vent kit not sealed
MICA window missing
Combustion air hose plugged or collapsed
Water in propane
Burner plate gasket or
pilot gasket not sealed
LAZY FLAME (yellow)
High gas pressure
Burner out of adjustment
Combustion wheel installed backwards or loose
Air leakage at gaskets
Low voltage
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FAN RUNS CONTINUOUSLY WITH THERMOSTAT "OFF"
Shorted thermostat leads
Defective relay
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Defective thermostat
INSUFFICIENT HEAT
Furnace under fired
specifications.
Furnace limiting
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Effective: 8/10/98
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*indicates NOT covered under warranty.
SOLUTION
Replace relay
Correct wiring*
Reconnect or replace power source.*
Replace blower wheel.
Replace motor
Tighten motor mounting bracket.
a. Make sure ducting meets furnace's minimum
b. Make sure there is no excess ducting or unnecessary
bends.*
c. Make sure any closable registers are fully open and
unrestricted.*
Clean or replace pilot orifice.
Adjust electrode to furnace's specifications.
Replace tube.
Replace sparker
Replace thermocouple.
Replace valve.
Seal vent where it meets with the furnace.*
Replace MICA
Replace combustion hose
Add alcohol to the propane bottles.*
Replace gaskets
*Set pressure to a minimum of 11˝ W.C. with all appliances
running. Replace regulator if not obtainable.
Adjust burner according to furnace specification.
Reposition wheel and tighten.
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Replace gaskets
Correct power supply*
Replace wire or wires.
Replace relay
Replace thermostat
1. Set gas pressure to 11˝ W.C. with all appliances running,
replace regulator if not obtainable. Also, check main
burner orifice, it must comply with furnace's
specifications.*
2. Check ducting and return air according to furnaces
Check ducting and return air. It must comply with furnace's
specifications.*
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