tempstar - Page 2

Posted by Noon-Air on January 27, 2009, 11:45 pm

> On Tue, 27 Jan 2009 07:25:00 -0800 (PST), robbie.hall@yahoo.com wrote:

>>> On Mon, 26 Jan 2009 16:02:52 -0800 (PST), robbie.h...@yahoo.com wrote:
>>> >Hello, I have a model FSU2x2400A air handler and a condenser model
>>> >EQ71924434. The unit will run for a hour and a half and trip 5 amp
>>> >control fuse. the tstat was replaced the control board in air handler
>>> >was replaced. the defrost control board and coil temp sensor was
>>> >replaced the unit still trips fuse in a hour and a half. the unit
>>> >works well in heat mode cool mode and emergency heat
>>> Too bad your mechanic is a parts changer. Start looking outside.
>>> Pay attention to the defrost cycle.
>>> Bubba

>>the unit was installed a year and half ago with no issues till now, a
>>new defost control board and coil temp sensor was replaced, the
>>reversing valve switches from heat to cool, I also believe it is
>>something to do with the defrost cycle. the unit had a older t-stat
>>replaced with a white rogers, replaced control board in air handler
>>also just trying to figure out what is going on, checked all wiring
>>continuity thought of a possible short, I guess the next thing would
>>be is check the charge, could be low causing coil temp sensor not to
>>make to let it go in defrost

> Id be looking outside for a short in one of the low voltage wires. The
> ones down in the unit where they are touching the copper. L.P. swich,
> H.P. switch, sensor, RV solenoid, etc.
> Bubba

I would guess the RV solenoid because it only seems to happen at 90 minute
intervals. It could be the RV coil gone, of a wire shorted to the RV
solenoid coil.

Posted by Bubba on January 28, 2009, 8:46 pm

wrote:

>> On Tue, 27 Jan 2009 07:25:00 -0800 (PST), robbie.hall@yahoo.com wrote:

>>>> On Mon, 26 Jan 2009 16:02:52 -0800 (PST), robbie.h...@yahoo.com wrote:
>>>> >Hello, I have a model FSU2x2400A air handler and a condenser model
>>>> >EQ71924434. The unit will run for a hour and a half and trip 5 amp
>>>> >control fuse. the tstat was replaced the control board in air handler
>>>> >was replaced. the defrost control board and coil temp sensor was
>>>> >replaced the unit still trips fuse in a hour and a half. the unit
>>>> >works well in heat mode cool mode and emergency heat
>>>> Too bad your mechanic is a parts changer. Start looking outside.
>>>> Pay attention to the defrost cycle.
>>>> Bubba
>>>the unit was installed a year and half ago with no issues till now, a
>>>new defost control board and coil temp sensor was replaced, the
>>>reversing valve switches from heat to cool, I also believe it is
>>>something to do with the defrost cycle. the unit had a older t-stat
>>>replaced with a white rogers, replaced control board in air handler
>>>also just trying to figure out what is going on, checked all wiring
>>>continuity thought of a possible short, I guess the next thing would
>>>be is check the charge, could be low causing coil temp sensor not to
>>>make to let it go in defrost

>> Id be looking outside for a short in one of the low voltage wires. The
>> ones down in the unit where they are touching the copper. L.P. swich,
>> H.P. switch, sensor, RV solenoid, etc.
>> Bubba

>I would guess the RV solenoid because it only seems to happen at 90 minute
>intervals. It could be the RV coil gone, of a wire shorted to the RV
>solenoid coil.

Normally Id guess that but the OP said:
"the reversing valve switches from heat to cool"
If its shorted it wont switch. Ive been finding the wires from the LP
and HP switch and even the sensor touch the coppper and the vibration
of the unit rubs through the insulation.
Bubba

Posted by HVAC on January 27, 2009, 7:20 am

> Hello, I have a model FSU2x2400A air handler and a condenser model
> EQ71924434. The unit will run for a hour and a half and trip 5 amp
> control fuse.

Shut the unit down after 1 hour 29 minutes, then
turn it back on. Repeat.

Problem solved.

the tstat was replaced the control board in air handler

> was replaced. the defrost control board and coil temp sensor was
> replaced the unit still trips fuse in a hour and a half. the unit
> works well in heat mode cool mode and emergency heat

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