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97 posts

Master Geek


# 251701 7-Jul-2019 18:28
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First problem:

 

We had an HRV (5 vent, 2 fan Arizona - plastic box type/touch screen model) installed 3-4 years ago. The first couple of years it seemed to work well, significantly reducing condensation. Being a DIYer when it came time to replace the filters, I did these myself. For a while now I've noticed the air output seems significantly lower than when first installed. I used to be able to hear it when the fans were on 100%, but not anymore. And, we are getting a LOT of condensation on the windows, even at ventilation level 6. I have checked and it definitely changes fan speed based on the wall controller, it just seems to have gotten a lot weaker. Everything else seems fine. I even bought new filters, thinking maybe they were clogged, they looked not too bad, but I replaced them anyway. However, the problem still exists. But I did find another issue:

 

 

 

Second problem:

 

One of the fan boxes had water in it (the slave), and the filter was quiet damp. I dried it out, and replaced the filter, but it seems to have stopped working altogether :S It was working just a couple of weeks back, as I checked it was responding to the fan speed changes when trying to solve the first problem. Our house is quite old, no roof membrane, so it's not uncommon to have a bit of water come in under the tiles. It may have run down the unit harness, and been sucked into the fan (I am assuming). It just seems weird it has only done this now, since last time I checked the filters, over a year ago, it was fine (and had been up for 2+ years prior to that). I checked the fuses (there were 2 fuses, but not sure if both being used, or one was a spare? - one seemed to be in a weird position). The fuse seemed fine. I didn't check the fuse of the master unit, but that seems to be working, except for problem one. How do the units talk to each other? The cable between them looks like power only :S Wireless? There is an address dial on the master, possible I inadvertently moved that?

 

 

 

So looking for any help I can get with the first problem, and the second. Thanks in advance!


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97 posts

Master Geek


  # 2275965 13-Jul-2019 17:39
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I took the faulty unit out today. Haven't taken it apart yet, but first off something looks not quite right. There's a little metal disc with a black plastic unit (yellow gunk/glue holding them together?) and two wires attached to it. Only the little disc doesn't appear to be sitting in the hole (which is at the centre of the fan unit). The wires are still attached, so not sure what the implications are. Any ideas?

 

 

 

As I found it, slightly protruding from the hole:

 

Click to see full size

 

After I moved it further out from the hole

 

Click to see full size

 

Wide shot:

 

Click to see full size


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  # 2276067 13-Jul-2019 19:45
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That is a thermal cutout, more than likely the capacitor on the motor has failed causing the motor to stall and overheat, the thermal cutout has then heated up and cut power to the motor.

 

 

 

 


 
 
 
 




97 posts

Master Geek


  # 2276093 13-Jul-2019 21:10
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That makes a lot of sense! Thank you! I'm guessing that the little metal disc it's attached too needs to be set back in place to conduct the heat then?

 

 

 

On top of the black plastic cylinder with the wires coming out of it there is a little shaft with a black plastic knob. Would this be a way of resetting it?


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  # 2276097 13-Jul-2019 21:16
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sometimes they can be reset sometimes they can't, but get it checked out by an electrician before using it again

 

 




97 posts

Master Geek


  # 2277060 15-Jul-2019 15:28
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Another problem solved. The low airflow is related to the filter (F8 from purchased Supercell). I tried running the unit, then sliding in the filter, the motor slows down considerably, I am guessing due to back pressure from air not being able to pass sufficiently through the filter. Pulling the filter out again, the motor picks up considerable speed. Quite concerning, so maybe there's an element of truth in HRV's marketing ploys when they say all other third-party filters are crap :S


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  # 2277144 15-Jul-2019 16:45
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dud you used to use an F8 filter from HRV?




97 posts

Master Geek


  # 2277195 15-Jul-2019 17:10
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The original F8 set was from HRV, yes. On to the second set of F8’s from Supercell.

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