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BURNER FAILS TO IGNITE AND BLOWER FAILS TO RUN
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CONDITION
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SOLUTION
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No electrical power to the furnace Current
overload protector device defective or tripped (circuit breaker)
Thermostat defective
Thermostat wires broken
Blower motor defective
Blower relay defective
Wire off motor
Wire off relay
Improper ground
Thermostat located in high area
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- Reconnect or replace power source
- Reset circuit breaker
Check amp draw from motor according to
furnace's specification.
- Replace thermostat
- Replace wire or wires
- Relocate thermostat
- Replace motor
- Replace relay
- Reconnect wire
- Reconnect wire
- Clean and secure grounds
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BLOWER RUNS BUT FAILS TO IGNITE
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CONDITION
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SOLUTION
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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
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- 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
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BLOWER SHUTS OFF AT SAME TIME BURNER SHUTS
OFF.
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CONDITION
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SOLUTION
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Faulty relay
Thermostat wired wrong
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- Replace relay
- Correct wiring
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BURNER CYCLING ON AND OFF - BLOWER RUNS
CONTINUOUSLY WITH THERMOSTAT "ON"
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CONDITION
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SOLUTION
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Restricted return air supply
Restricted discharge duct system
Defective limit switch
Furnace over fired
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- Make sure return air meets furnace's minimum requirements.
- a. Make sure ducting meets furnace's minimum requirements
b. Make sure there is no excess ducting or
unnecessary bends
c. Make sure any closeable registers are fully
open
and unrestricted
- Replace limit switch.
- Set gas pressure to a minimum of 11"W.C.
with all appliances running. Replace regulator
if not obtainable
Also, check main burner orifice, it must comply
with furnace's specifications
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BLOWER VIBRATES OR IS NOISY
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CONDITION
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SOLUTION
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Damaged blower wheel
Motor shaft bent
Loose motor
Restricted discharge duct system |
- Replace blower wheel
- Replace motor
- Tighten motor mounting bracket
- a. Make sure ducting meets furnace's minimum
requirements
b. Make sure there is no excess ducting or unnecessary bends
c. Make sure any closeable registers are fully open and unrestricted
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PILOT FAILS TO IGNITE OR STAY LIT
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CONDITION
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SOLUTION
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Plugged pilot orifice
Electrode out of adjustment
Pilot tube defective
Piezo sparker defective
Defective thermocouple
Defective valve
Vent kit not sealed
MICA window missing
Combustion air hose plugged or collapsed Water in propane
Burner plate gasket or pilot not sealed |
- Clean or replace orifice
- Adjust electrode to furnace's specifications
- Replace tube
- Replace sparker
- Replace thermocouple
- Replace valve
- Seal vent where it meets the furnace.
- Replace MICA
- Replace combustion hose
- Add alcohol to the propane bottles.
- Replace gaskets
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LAZY FLAME (yellow)
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CONDITION
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SOLUTION
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High gas pressure
Burner out of adjustment
Combustion wheel installed backwards
Air leakeage at gaskets
Low voltage |
- 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
- Replace gaskets
- Correct power supply
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FAN RUNS CONTINOUSLY WITH THERMOSTAT
"OFF"
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CONDITION
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SOLUTION
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Defective thermostat
Shorted thermostat leads
Defective relay |
- Replace thermostat
- Replace wire or wires
- Replace relay
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INSUFFICIENT HEAT
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CONDITION
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SOLUTION
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Furnace under fired |
- 1. Set gas pressure to 11"W.C. with all appliances running.
Also, check main burner orifice, it must comply with furnace's specifications
2. Check ducting and return air according to
furnace's specifications
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