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!