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RV Furnace Parts

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RV Furnace Trouble Shooting - RV Furnace Trouble Shooting Page
TROUBLE SHOOTING THE PILOT RV FURNACE


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The following is a list of potential problems for the old (No Longer Made) Pilot Furnace Models. This is offered not as a guide but only as potential solutions/possibilities that your Technician may consider before Replacing the Furnace with the Modern DSI Furnace.  

BURNER FAILS TO IGNITE AND BLOWER FAILS TO RUN


CONDITION

     SOLUTION

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
  •  

    • 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

    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

    BLOWER SHUTS OFF AT SAME TIME BURNER SHUTS OFF.


    CONDITION

         SOLUTION

  • Faulty relay
  • Thermostat wired wrong
  •  

    • Replace relay
    • Correct wiring

    BURNER CYCLING ON AND OFF - BLOWER RUNS CONTINUOUSLY WITH THERMOSTAT "ON"


    CONDITION

         SOLUTION

    Restricted return air supply

     

  • Restricted discharge duct system
     
     
     

  • Defective limit switch
  • Furnace over fired
  •  

    • 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

    BLOWER VIBRATES OR IS NOISY


    CONDITION

         SOLUTION

  • 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

    PILOT FAILS TO IGNITE OR STAY LIT


    CONDITION

         SOLUTION

  • 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

    LAZY FLAME (yellow)


    CONDITION

         SOLUTION

    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

    FAN RUNS CONTINOUSLY WITH THERMOSTAT "OFF"


    CONDITION

         SOLUTION

  • Defective thermostat
  • Shorted thermostat leads
  • Defective relay
  •  

    • Replace thermostat
    • Replace wire or wires
    • Replace relay

    INSUFFICIENT HEAT


    CONDITION

         SOLUTION

  • 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

      Our Parts Inventory includes same day shipping of the following

      Suburban Trailer Furnace Parts - Suburban Trailer Range and Cooktop Parts - Suburban Trailer Water Heater Parts - Hydro-Flame Trailer Furnace Parts - Duo-Therm Trailer Furnace Parts - Coleman Trailer Furnace Parts - EverestStar Trailer Furnace Parts - Atwood Trailer Furnace Parts - Excalibur Trailer Furnace Parts - Suburban Trailer Water Heater Parts - Atwood Trailer Water Heater Parts - Mor-Flow Trailer Water Heater Parts - American Appliance Trailer Water Heater Parts - American Standard Trailer Water Heater Parts - Atwood Trailer Range and Cooktop parts - Wedgewood Trailer Range and Cooktop Parts

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