Tiffin Zephyr – Furnace Igniter & Control Board Replacement

After buying, repairing, and reselling more than thirty rigs, I’ve crawled into every corner of every coach body style you can name. I know exactly which systems manufacturers cut corners on, which repairs look scary but are actually straightforward, and which ones will drain your wallet if you wait too long. The furnace on a Tiffin Zephyr falls squarely into that last category — when the igniter or control board starts failing, most owners hear one weak click, assume it’s a propane issue, and spend weeks chasing the wrong problem while the temperatures drop. What you actually have is a failed igniter electrode or a burned-out control board, both of which are completely replaceable with basic tools and a few hours of focused work. I’ve done this exact repair more times than I can count, and this guide will walk you through every step so you don’t waste money on a service call for something you can absolutely handle yourself.

The Igniter That Actually Fires Again on a Tiffin Zephyr

The Suburban furnace igniter in a Zephyr fails silently — you get one weak spark, then nothing, and the control board times out thinking there’s no propane. This electrode assembly is the first thing that needs replacement before you start chasing phantom gas line problems.

What works

• Ignition spark returns to full strength immediately — you’ll hear the audible pop when propane hits the hot electrode again.
• The wire assembly comes pre-attached so you’re not soldering or crimping connections in a tight furnace cabinet in a moving rig.
• Direct fit to SF-series Suburbanans — no adapter hunting or cross-compatibility guessing on a Zephyr.

What doesn’t

• Clearance inside the combustion chamber is tight — you need a 7/16″ wrench and a swivel socket, or you’ll strip the mounting nut trying to force a standard wrench in there.
• Aftermarket electrode tips can vary in gap spacing; if the spark is weak even after replacement, you may need to file the gap down slightly or you’re fighting the igniter all over again.

I replaced an igniter on a ’19 Zephyr that looked brand new and still had weak spark, and only realized the gap had been set too wide at the factory — a five-minute adjustment with a feeler gauge solved it. If your furnace still clicks without igniting after swap, check the electrode gap before blaming the part. Fit For Suburban RV Furnace Parts 232286,Single Probe Gas Furnace Igniters Electrode with Wire Assembly, Camper Furnace For Suburban 232286 Above 934701426 SF-20, SF-25, SF-30, SF-35 (SF Series)

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