Coleman Mach PTCR Start Relay 1497-9021
Coleman Mach PTCR Start Relay 1497-9021 — Product description
The genuine Coleman PTCR start device, part 1497-9021, for Mach rooftop air conditioners. It's the start relay only, sold without a capacitor, so you replace just the part that failed when your compressor hums but won't spin up.
When a Coleman Mach rooftop air conditioner hums but the compressor won't spin up, the PTCR start device is one of the first things a good tech checks. This is the genuine Coleman start relay, part number 1497-9021. It's the relay only, sold without the run capacitor, so it drops right in when the start device is what's failed and the rest of your control gear is still good.
PTCR stands for positive temperature coefficient resistor. In plain terms, it's a small solid-state part that gives the compressor motor the electrical kick it needs to get moving, then backs itself out of the circuit once the motor is up to speed. There are no mechanical contacts to burn or stick like an old-style relay. When one goes bad, you usually get the tell-tale symptom. The AC clicks on, the fan runs, but the compressor just buzzes and trips the breaker or shuts down on overload. Swap the start device and, more often than not, cold air comes right back.
This part fits a wide range of Coleman Mach units. The compatibility list covers dozens of Mach model numbers, from the 6000 and 7000 series through the 8000 and 9000 series and many of the 48000-series units. Check your unit's model number against the fitment list before you order. The model plate is usually on the ceiling assembly inside or on the shroud up top.
A couple of honest notes. This is the start relay by itself. It doesn't include the capacitor, so if your capacitor is also swollen or reading out of spec, you'll want to replace that separately. And it sits on the live AC side of the wiring, so kill the shore power and unplug before you go poking around on the roof. If you're comfortable pulling the AC shroud and reading a wiring diagram, it's a quick job. If not, any RV tech can handle it fast.
We keep genuine Coleman RVP parts in stock because guessing on AC components wastes a hot afternoon at the campground. Match your model, confirm you need the relay and not the full start kit, and you're set.
Key Features
- Genuine Coleman PTCR start device, part number 1497-9021, for Mach rooftop air conditioners
- Relay only, supplied without a run capacitor, so you replace just the part that failed
- Solid-state PTCR design with no mechanical contacts to burn out or stick
- Gives the compressor the start boost it needs, then drops out of the circuit once it's running
- Fits a wide range of Coleman Mach models across the 6000, 7000, 8000, 9000, and 48000 series
- Direct-fit fix for a compressor that hums but won't start
Why Buy from NVN Marine
- Authorized Coleman reseller, full manufacturer warranty
- NMEA member and ABYC certified, advice from real boat techs
- Same-day shipping before 3 PM ET on in-stock items
- NY headquarters and Fort Lauderdale flagship retail store
Technical specifications
| Title | Coleman Mach PTCR Start Device (Start Relay) |
|---|---|
| Brand | Coleman |
| Manufacturer | Coleman RVP |
| Manufacturer Part Number | 1497-9021 |
| UPC | 755790410125 |
| Component Type | PTCR Start Device (Start Relay) |
| Capacitor Included | No |
| Application | RV Rooftop Air Conditioner |
| Compatible Models | Coleman Mach 46413, 48203, 48204, 48207, 48208, 48213, 48253, 48254, 48257, 48263, 48264, 48268, 6633, 6636, 7333, 7633, 8333, 8335, 8433, 8534, 8535, 8632, 8633, 9013, 9021, 9031, 9201, 9202, 9232, 6799, 46515, 48004, 48008, 48014, 48058, 48064, 48068, 6535, 6537, 9001, 9002, 9003, 9014, 9022, 9023, 9024, 9032, 9033, 9034 |
Frequently asked questions
What does this PTCR start device actually do?
It gives the air conditioner's compressor motor the electrical boost it needs to start, then drops out of the circuit once the motor is running. When it fails, the compressor typically hums but won't spin up.
Does this include the capacitor?
No. This is the start relay (PTCR) only, sold without a capacitor. If your capacitor is also bad or reading out of spec, you'll need to replace that separately.
Which Coleman Mach units does it fit?
It covers a long list of Mach models across the 6000, 7000, 8000, 9000, and 48000 series. Check your unit's model number against the compatibility list, found on the model plate on the ceiling assembly or the rooftop shroud, before ordering.
How do I know if my start device has failed?
The classic sign is that the fan runs and the unit clicks on, but the compressor just buzzes and won't start, sometimes tripping the breaker or shutting down on overload. A failed PTCR is a common cause of exactly that.
Is this a genuine Coleman part?
Yes. This is the genuine Coleman RVP part, MPN 1497-9021.
Can I replace it myself?
If you're comfortable pulling the AC shroud and reading a basic wiring diagram, it's a quick job. Cut the shore power and unplug first, since it's on the live AC side. If you'd rather not go up on the roof, any RV tech can swap it fast.
