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-   -   RPJ2 Blower fan will not stop running (http://www.diychatroom.com/f17/rpj2-blower-fan-will-not-stop-running-49076/)

number22 07-17-2009 03:24 PM

RPJ2 Blower fan will not stop running
 
I have a RPJ2 furnace which is 12 years old now. We had a storm in our our area last night with lighting which knocked our electric out momentarily. The furnace blower fan has been running none stop ever since the electric outage. I even disconnected my T-stat which is a (Honeywell RTH7400D I've had for 3 years) and the blower fan will still run without any connections to the T-stat.

I can only stop the blower by turnig the switch off at the furnace.

The A/C will run and go off via the T-stat, but the blower will go off for a second and then start running again none stop.

When I turn the blower on manually with the furnace switch, it takes about 45 seconds for the blower to come on and then it will run non stop.

Could it be a fried circuit board or a relay that is stuck, I've kind of ruled out the T-stat. I think the lighting knocked something out.

Can anyone give me some insight or help.

yuri 07-17-2009 03:54 PM

The board probably got damaged by the power surge. It is now unsafe to use for the heating cycle also. I would get a experienced Heil/ICP tech to check that furnace for safety as it has a history of cracked heat exchangers/popped compression rivets in the heat exchanger.

number22 07-17-2009 04:31 PM

Is my best fix a new fan timer control board ?

I know the comfortmaker part number is 1009838 and is fairly affordable.:)

Is the installation of a new fan timer control board hard to do ? :hammer:

Yoyizit 07-17-2009 04:54 PM

To prevent unnecessary parts changeouts and find the root cause, post a schematic, but it does kinda' sound like damaged electronics at a minimum.

If you're in FL or the Ozarks, whole house surge protection would have spec's like these:
4000 joules, total
80,000 amps, max
Insurance, $5k per item
design lifetime 10 yrs.

number22 07-17-2009 05:05 PM

I had no idea a surge could effect my heating and cooling system like that.

:thumbsup::eek:

Yoyizit 07-17-2009 05:30 PM

Quote:

Originally Posted by number22 (Post 303302)
I had no idea a surge could effect my heating and cooling system like that.

:thumbsup::eek:

You should see what elec. surges do to some people.:eek:
And getting replacement parts is very difficult, depending on what part you fried.

number22 07-17-2009 05:36 PM

I can only imagine !!!!

Good point !!!!

number22 07-19-2009 05:03 PM

Update: after Thursdays storm and Fridays investigation. Late Friday night I was still doing the manual on /off switch thing at the furnace, after I ran a cycle I had to do a quick reset of the T-stat tempature, which put the T-stat in "Wait" mode. The blower finally cycled back in with the system and I've had no problem since.

The blowers is back to it's normal self.

I do however think the outage on Thursday really set this whole events in motion. I'm glad I waited ,and I'm glad I investigated myself to gain more knowledge.

I've since changed the air filter and cleaned the furnace/compressor unit inside and out. I've also cleaned the central A/C unit outside.

The system reminds me of a PC, it's very delicate and should be treated with care. This event has sure opened my eyes to the Heating and cooling units maintence and care.

:thumbup::thumbsup:

Yoyizit 07-19-2009 06:27 PM

Quote:

Originally Posted by number22 (Post 304110)
The blower finally cycled back in with the system and I've had no problem since.

The blowers is back to it's normal self.

I do however think the outage on Thursday really set this whole events in motion.

The system reminds me of a PC, it's very delicate and should be treated with care. This event has sure opened my eyes to the Heating and cooling units maintence and care.

:thumbup::thumbsup:

They could have designed a software loop that would have detected and automatically reset this condition.

From another thread I infer that the factory knows how to reset this condition. They may or may not tell you how to do it.

More complexity = more fragility. My relay-logic furnace controller has never failed or even burped, since 1992.

And it's the same in nature; lower forms of life are unharmed by doses of radiation that would kill humans outright. :eek:


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