Air handler blower will not shut off


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Old 01-14-16, 10:21 AM
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Air handler blower will not shut off

Greetings everyone, new to the forum.

I have a Goodman ARUF48601 handler, fan will not shut off. I have done some diagnostics based on other threads I have seen here on this forum and I still need assistance. Stat is a Honeywell RTH6350. Stat and handler board components (don't know exactly what) were replaced about 6 months ago by a local hvac company. Heat and cold work fine, but apparently the fan has always been on (I don't live there). Stat has auto and on for fan, no effect when changed. I researched the stat wiring, all appears correct. I can remove G from stat and it has no effect on the fan. Pulled the panel off the handler and put the meter to a few items I saw noted in other threads. G wire has 6 vac on it at all times. When stat fan is engaged, G goes to appropriate 24 vac. Measured EBTDR at C and R, shows 24 vac. Don't want to call hvac company that did the board repairs unless I can prove a warranty issue.

Any help is greatly appreciated!
 
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Old 01-14-16, 11:13 AM
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Welcome to the forums.

If you disconnect the stat from the air handler.... or at least the G connection..... and the blower still runs.... The timer board is defective or more likely a sequencer issue. Both can keep the blower running.

Click on pic for larger view.
 
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Old 01-14-16, 11:59 AM
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Thanks PJ. I had seen a similar thread where Houston replied with similar info. Is there a way to test the sequencer and timer board?
 
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Old 01-14-16, 04:43 PM
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The sequencer is sending high voltage From PLF3 on the harnes to the NC (normally closed) terminal on the EBTDR.

If you unplug that wire and the fan isn't stuck on anymore it would point to a sequencer problem.
 
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Old 01-14-16, 05:45 PM
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Oh...sorry. I posted the diagram and forgot to tell you what to do. Thanks Houston.
 
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Old 01-18-16, 12:56 PM
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Well, After verifying the the PLF3 wire removal did shut the blower off, I replaced the sequencer....blower still won't shut off. Any suggestions? Should I look at that Honeywell stat wiring any closer?
 
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Old 01-18-16, 04:59 PM
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The sequencer may be improperly wired or it may be getting 24 volts to the base.

PLM 3 should land on the same side of the sequencer as the heating element. If it is on the hot side of the sequencer the fan would never turn off.

We had another poster with this problem.

http://www.doityourself.com/forum/ai...-turn-off.html

If you post some pictures of the sequencer area we may be able to offer more detailed assistance.
 
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Old 01-19-16, 07:59 AM
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Pics as requested:
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Old 01-19-16, 10:19 AM
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That first picture is probably the key but it is dark. Do you own a drop light?
 
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Old 01-19-16, 10:56 AM
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See if this works Houston:
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Old 01-19-16, 05:05 PM
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Yep, it looks like you gave the same problem.
Pink is on the wrong side of the sequencer.

It is on top along with the incoming power wire on that red wire nut with tape.

It should be on the other side that feeds the heating element.

I can give you arrows when I get home.
 
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Old 01-19-16, 06:12 PM
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Got it! ....Fixed !

You guys are awesome, really appreciate the help.

This culminates a very poor repair from a local and reputable HVAC contractor that wound up costing me initially an additional $1000 in electricity (no exaggeration) due to misdiagnosis (they didn't know the emer heat and cool was operating simultaneously) and now appx $300 in electricity over the past 7 months for the blower fan mis-wired. Nice....
 
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Old 01-19-16, 09:26 PM
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I am glad that you were able to resolve this problem with our assistance

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Last edited by Houston204; 01-19-16 at 09:48 PM.
 

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