I found myself once again doing some EcoQuest Fresh Air II air purifier repairs. One of ours quit making ozone. I opened it up but could not find the problem. After looking at it several times and getting ready to salvage parts and toss it, I then discovered that R11 was toast. Checking the FET, a 10N20L showed that it was shorted!
I disconnected the 10N20L by clipping the leads and it was still shorted. R11 was toast and there was no way to find out its value. Unfortunatly I threw out my spare board! Oops.
I could not find a 10N20 but did find a IRF630 that has similar specs and used that. The drain is connected by the case but the replacement will not solder to the board so you will need to run a small jumper wire. A 4.7 ohm one watt resistor will work for R11 as it was a current limiter resistor (I think).
So it has been up and running for a couple of hours now with no problems.
1 comment:
Really enjoyed reading this post. It’s always great to find useful discussions around cleaner indoor environments and maintenance solutions. Many users still look for trusted options for EcoQuest repair because regular servicing can improve long-term performance and air quality support. Thanks for sharing such informative content and practical insights with readers.
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