Complete repair guide for the KZ Durango – Furnace Igniter & Control Board Replacement. Follow these steps to diagnose and fix the issue yourself.
Parts & Tools You’ll Need
- Suburban/Atwood RV furnace replacement unit
- Furnace igniter electrode assembly
- Furnace sail switch
- Furnace circuit board / control board
- Furnace high-limit switch
- Furnace blower motor (12V DC)
- Propane/CO combo detector alarm
- Digital multimeter (auto-ranging)
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Step-by-Step Repair Guide
Step 1: Diagnose Furnace Problems Safely
Before beginning any work, ensure your RV is parked on level ground with the propane system shut off at the tank and all electrical systems disconnected. Use your digital multimeter to test for voltage at the furnace control board and listen for clicking sounds from the igniter electrode, which indicates whether the problem is electrical or mechanical in nature.
Step 2: Remove Old Furnace Assembly
Locate your Suburban or Atwood furnace unit (typically mounted in a cabinet or wall compartment) and disconnect all electrical connectors from the control board, blower motor, and sail switch. Remove the mounting bolts securing the furnace to the frame and carefully slide the entire unit out, noting the propane line connection points for reinstallation reference.
Step 3: Install New Furnace Unit
Position your replacement Suburban/Atwood furnace into the same mounting location and secure it with the original or new mounting bolts. Reconnect the propane line using a new shutoff valve and double-check all connections for leaks using soapy water before proceeding with electrical connections.
Step 4: Connect Control Board Components
Install the new furnace circuit board and reconnect the igniter electrode assembly, sail switch, and high-limit switch according to your RV’s wiring diagram. Ensure the 12V DC blower motor is properly connected to the control board terminals, as these components work together to regulate furnace operation and safety.
Step 5: Secure Igniter Electrode Assembly
Position the igniter electrode assembly into the combustion chamber mounting bracket, ensuring it sits at the correct distance from the burner port as specified in your furnace manual. Tighten the mounting hardware securely so vibration during travel won’t dislodge the electrode and interrupt the ignition spark.
Step 6: Install Propane CO Detector
Mount your propane/CO combo detector alarm in a central location inside the RV where you’ll easily hear audible alarms, typically near sleeping areas. Connect it to a 12V power source and ensure the detector has a clear path for air circulation so it can function properly.
Step 7: Test All Furnace Functions
Reconnect your RV’s electrical system and propane tank, then set the thermostat to heat mode and observe whether the igniter electrode sparks and the blower motor engages within 30 seconds. Use your digital multimeter to verify proper voltage at the control board and listen for the blower motor running smoothly; if the furnace cycles on and off normally while the CO detector remains silent, your replacement is successful.
Recommended Parts
| Part | Link |
|---|---|
| Suburban/Atwood RV furnace replacement unit | View on Amazon |
| Furnace igniter electrode assembly | View on Amazon |
| Furnace sail switch | View on Amazon |
| Furnace circuit board / control board | View on Amazon |
| Furnace high-limit switch | View on Amazon |
| Furnace blower motor (12V DC) | View on Amazon |
| Propane/CO combo detector alarm | View on Amazon |
| Digital multimeter (auto-ranging) | View on Amazon |