001 / See the error codes
Marten Coil decodes the blinking error light, tracks every filter and capacitor, and tells you what to buy — so you stop paying a stranger $400 to press a reset button.
Start diagnosing ↗Point at the flashing LED, count the blinks, get plain-English cause and the exact part number. No manual named 'FINAL_v3.pdf' required.
Automatic reminders for filters, coil cleans, and belt swaps per unit. It nags you so your compressor doesn't die in July.
Track charge, pressures, and superheat readings over time. Spot the slow leak months before the house turns into a sauna.
Model numbers, receipts, and warranty dates in one place. When the board fries, you already know it's covered.
Guided fall and spring tune-ups written for humans, not licensed techs. Fifteen minutes, zero guesswork.
Stuck at 11pm? Message a vetted HVAC pro and get a straight answer before you rip out a working valve.
Field reports
“I stared at three blinking lights for an hour before I found Marten Coil. Turned out to be a $14 flame sensor, not the $2,900 furnace the shop quoted. I cleaned it myself in the driveway.”
“I flip and rent a handful of units, and I was drowning in filter dates and warranty PDFs. Now every system has a page. My tenants text less, which is the whole point.”
“I run HVAC on the side for neighbors. The refrigerant log alone got me a repeat customer who saw the leak coming a season out. Feels illegal how simple it is.”
Rates
For the person who owns exactly one furnace and one strong opinion.
Furnace, AC, mini-splits, that mystery box in the crawlspace.
For landlords and side-hustlers running way too many units.