Hello, I'm a homeowner and I have a question about our Honeywell Electronic Air Filter which is experiencing what seems to be power issues. We've had two companies out to fix it and neither has been able to. I initially noticed the power wasn't coming on at all during a heat cycle. After a tech replaced one of the power components (sorry, not sure which one), I did see it on a couple of times. But at least one of those times, it didn't kick on until the unit had been running for a minute. I checked again a few days later and saw no activity at all. Another tech came out and found a dip switch (?) on the power board was set to the wrong voltage. It seemed to be working when he left. But next morning when I checked, the unit was making a whirring sound and power light was flickering off and on. They're coming back today for the fourth time. But since it seems to be such a mystery (3 techs and 2 companies now) I wonder if anyone here has any ideas of what to look for? Thanks!!