Broan IQ Drive Blower motor Fault.

[empeters]

Newby here.

I had a 20+ SEER Broan IQ drive Heat pump/97+ gas split system installed in my home last February. All was fine for a while until the weather started warming up and I started getting a fault on the IQ Drive controler (thermostat) saying "Blower Motor Fault". The first time it happend I cycled power on the unit and it worked again. About a week later it happend again but took a much longer time to clear the fault. I had the installer out to look things over but he couldn't find anything a miss.

He says that Nordyene (manufacturer of technology) had some of there blower motors that were susseptable to low voltage on the AC line. When the installer was here he measured 107VAC at the motor and it was functioning at that time.

Since that time the fault has happend about three more times. Each time it happens is during peak draw (noon - 6:00pm). Also, I've measured the voltage during the fault condition and the line voltage is has been as low as 103VAC. It seems that the motor faults out at around 105VAC.

Has anybody out there ever experianced this before? Do you think we're barking up the right tree? Any help appreciated.

[skippedover]

The tolerance for electrical service is 120-volts, (+) or (-) 10%. That means as low as 108-volts and as high as 132-volts. Any other voltages are unacceptable. You need an electrician or power company to solve your voltage problems before blaming the equipment. If you fail to put gasoline in your car, it stops. Not the car's fault. Same thing here. Get the electrics fixed and if nothing has been hurt by the low voltage, you should be okay. Keep in mind that low voltage can also do damage, so....

[empeters]

That's what I thought someone would say. Looks like I'll have to call the power company. This is a bad time to be calling them on the east coast.

Thanks for your help! I'll let you know what we find.

[empeters]

It has been quite a while since I started this thread concerning the Blower Motor fault on the Broan IQ Drive system. As it turned out, I had to have the power company come out twice. There were problems with the voltage line regulators which caused the voltage to drop too low. Once the power company resolved the problem ( 2 attempts required) the blower motor faults quit.

So if you have one of these systems and get this fault the first thing you should check is the line voltage. If it gets down to 107VAC or lower this is the problem.

I hope this helps someone out there.

Eric