Complete repair guide for the DRV Mobile Suites – 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 Issues Safely
Before beginning any work, turn off power to your RV’s furnace system at the main disconnect switch and ensure propane is shut off at the tank. Use your digital multimeter to test for voltage at the furnace terminals to confirm power is completely disconnected, then visually inspect the igniter electrode for cracks, discoloration, or carbon buildup that would indicate failure.
Step 2: Remove Furnace Access Panel
Locate and unscrew the furnace access panel on the exterior of your RV, typically found near the propane tanks or on the side wall. Carefully set aside all fasteners in a labeled container and gently pull the panel away to expose the internal furnace components and wiring harnesses.
Step 3: Disconnect Electrical Connectors Systematically
Photograph or label each electrical connector before disconnection to ensure accurate reassembly, as furnace systems have multiple terminals for the igniter, sail switch, and control board. Gently unplug the connectors by gripping the plastic housing rather than pulling on the wires themselves to avoid damaging the terminals.
Step 4: Replace Igniter Electrode Assembly
Locate the igniter electrode inside the furnace combustion chamber and note its position relative to the burner assembly. Remove the mounting bracket bolts, pull out the old electrode, insert the new one in the same position, and secure it with the original or new fasteners, ensuring the electrode gap is approximately 1/8 inch from the burner.
Step 5: Install New Control Board
Remove the old control board by unbolting it from the furnace housing and carefully setting it aside. Position your new circuit board in the identical location, install the mounting bolts, and reconnect all electrical harnesses according to the labels or photographs you created during disassembly.
Step 6: Reconnect All Remaining Components
Verify that the sail switch, high-limit switch, and blower motor connectors are all firmly seated in their respective terminals. Double-check your reference photos or labels to confirm each connection is correct before closing the access panel.
Step 7: Test System Functionality Completely
Restore power and propane, then set your thermostat to heat mode and listen for the igniter clicking and the blower motor activation. Use your digital multimeter to verify proper voltage at each component, and ensure your propane/CO detector alarm activates normally; if the furnace fails to ignite or shows error codes, immediately shut down and recheck all connections.
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 |