Most of the service calls I get aren’t emergencies — they’re deferred maintenance that finally gave up. The owner noticed something off weeks ago, ignored it, and now they’re calling me from a campground two states from home. Nine times out of ten, this repair could have been done for a fraction of the cost if they’d caught it early. With a New Horizons furnace, the igniter and control board are the two components I see fail most often — usually signaled first by a furnace that sparks but won’t light, or one that clicks endlessly and shuts off without ever producing heat — and when that happens in January at elevation, it stops being an inconvenience and starts being a safety issue. I’ve put together this guide based on the actual steps I run through on-site, so whether you’re a confident DIYer or just trying to understand what your technician should be doing, you’ll know exactly what a proper repair looks like.
The Control Board That Saved Me From a $2K Emergency Call
When your New Horizons furnace sparks but won’t ignite, nine times out of ten the igniter fires just fine — it’s the control board that’s silently failed. I learned this the hard way, sitting in a campground at 2 AM with a dead furnace, realizing I’d ignored the warning signs for three weeks.
What works
- Direct replacement for Atwood/Suburban units — no adapter kits or rewiring needed, just swap and test
- Catches the igniter spark but won’t release propane to the burner (the classic symptom) — diagnosing this yourself with a multimeter costs you 20 minutes instead of a $400 service call
- Affordable enough that replacing it as preventive maintenance before a full-unit failure actually makes financial sense
What doesn’t
- Installation requires killing propane supply and confirming the furnace actually powers on — if you’re not comfortable working with gas appliances, this one belongs on a technician’s bench
- Doesn’t solve igniter failures or sail switch issues — you still need to know which component failed before you order, or you’ll end up with parts you don’t need
I almost ordered a whole new furnace unit before testing the control board with my multimeter and seeing zero continuity on the relay. Furnace circuit board / control board costs a fraction of that, and three seasons later I’ve never looked back.
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