A tumble dryer that didn’t dry
This machine is our very own, which decided to stop drying clothes. Everything seemed to work; the drum was going around, the timer was working and nothing sounded out of sorts, but it started taking longer and longer to dry clothes. In short, it wasn’t well.
This particular model is well documented online as it’s the same one with a world-wide model recall. Fortunately, Hotpoint/ Indesit/ Creda/ Ariston have an excellent recall process and information service. In fact if you’re concerned about yours, please visit http://www.hotpointservice.co.uk/safety-notices/ to see if your machine is listed. This machine had been modified and was cleared safe for use.
Anyway, it was time to dig out the tools. There’s not much to a tumble dryer really, the most expensive and important part being the motor, which in this case was fine. Having tested the heating elements for suitable resistance, it was time to check the wiring, which also tested fine.
Since the machine would heat up and then cool, it suggested a temperature control system fault. This machine has three temperature sensors; one in the exhaust and two on the back of the heater, the latter two to act as heat control and safety cut out.
If you’re still reading, it turned out that the exhaust thermostat sensor was at fault. Once it has allowed a brief heat cycle, it would shut down for ages. It had excess temperature switch ‘hysteresis’. The spare part was about £12, so versus the cost of a replacement machine at about £170, it was well worth spending time on the machine.