Jump to content
Tahoecoe

Display 32F, new upper controls, new temp sensor

Recommended Posts

2003 Sojourn HP @Home, Dimension One spa; third control pack, p/n 1782-1000 installed Dec 2010.  Symptoms:  set point is 102F, actual water temp per Thermapen is 102F, display shows 32F, pump/heater pulses on for a second then shuts off.  Did reset, let it cool to below 97F, then turned back on breaker.  Same symptom returned.  Part-monkey action to date:  (actually per recommendations from easyspaparts.com) - replaced upper display, p/n 01560-345-6C.  Wired it up, let it hang outside of tub cover for a few days, no similar symptom.  Installed/caulked it in, worked fine for 5 days, then same symptoms returned.  Then, got new temp sensor, 01560-79; plugged it in hanging over the edge.  Worked fine for several days.  Installed it in, with new wall-mount assembly/oring, repacked insulation around sensor.  Worked fine for about 5 days, then same symptoms returned:  display shows 32F, pump/heater cycles on for a second every  minute or so, set temp is 102, water temp is 102F.  

Ideas?

Share this post


Link to post
Share on other sites

Get a Free Hot Tub Quote

Save time and money by receiving multiple, independent quotes for a hot tub.

It seems like every time you open the spa pack to change something, the problem goes away.  My guess is that you have either a loose wire or a dirty connection.  When you close the pack after changing a component, is the cover fitting neatly, or do you have to force it in?  Maybe you're knocking one of your sensor connections off?  Are the pins on the temp sensor receptacle on the circuit board dirty?  Try sanding them with a little emery cloth.

Just for kicks, try re-connecting the old temp sensor and see if the problem goes away or remains.  I'm just curious if the sensor was a problem, or if the connection had something to do with it.  Don't install it, just put it into the circuit board and see if it works when you power up the tub.

Circuit boards do go bad, but I've never seen a 5 day intermittent circuit board problem that temporarily corrects itself when a part is replaced.


Dave

Share this post


Link to post
Share on other sites

Dave, thanks so much.  

When closing the pack, I don't see anything that is getting pinched.  The cover fits without any resistance or interference, I don't have to force it, it closes easily.  

I did sand the temp sensor connector pins on the board.  I didn't bother trying the original temp sensor.  After 24 hours, the display is showing 102F, the set temperature.  So far so good.  I'll monitor for the next 4 days to get through the weird 5-day window of behaving.  Hopefully the dirty connectors was the root cause afterall.  (so glad I have a new temp sensor and upper display...)

On a side note, while having the breaker off for the last week, the hot tub had fun building up scale, bumps, a million little barnacles or whatever it is.  It scrapes off easily enough, but will require some elbow grease and a beer to get it all removed.  

Thanks.

Dan.

Share this post


Link to post
Share on other sites

Dan,

 

This is unusual, easiest way to test is plug in a sensor and toss it over the bar top and see if the issue remains after the 5 day window. These S-class packs  are pretty bullet proof, that being said, this is usually a sensor or the pack.  If you would like to discuss in depth, you can call me at (866) 418-1840.

 

Thanks,

Dennis

Share this post


Link to post
Share on other sites

Unusual indeed!  I tried that, with the new sensor, hanging over the edge, for a few days and no symptoms.  Installed the new sensor in the wall and within a day or two, the 32F was showing on the display.  

It's day three after sanding the terminals inside the connector on the board and as of this morning it was not acting up!  I'll follow up in a few days with a post-5-day report.

On the S-Packs, not so sure they are bullet proof, as I'm on my third unit.

Thanks Dennis, appreciate the input.

 

Dan.

Share this post


Link to post
Share on other sites

Some more information:  the transformer is loose on the PCB inside the control pack.  The wires are tight, but the whole unit is wobbly on the PCB itself.   Secondly, when I manually turn on pump 2 by pressing the upper display, the temperature reading on the display starts going batty, 32, 99, 102, 32, etc.  That does not occur when I manually turn on pump 1.  

Share this post


Link to post
Share on other sites

Does pump two cause vibrations that might be reaching the circuit board?  There could be a bad solder joint on the transformer that's affected by vibrations.

If you disconnect pump 2, will the spa function normally?  That will take a few days to ascertain.

If you plug pump 1 into pump 2's socket, does the erratic change in the display stop?

if you trace the wires from the pump 2 socket to the circuit board, are the wires in good shape and are those connections on the circuit board clean?

Dave

 

Share this post


Link to post
Share on other sites

Hello,

Late follow up due to holidays and a demanding 4 year old....

The symptoms are gone.  I did not disconnect either of the pumps.  The only thing I did was unscrew the mounting screws on the transformer to turn it around to get the part number.  (The 'looseness' I mentioned in an earlier post was simply just the mounting bracket that's behind the PCB).  Then jiggled the input/output wires on the transformer, trying to determine possible loose connections on the transformer itself.  Then screwed it back onto the mounting bracket.  It was extremely hot to the touch initially.  

And none of those symptoms have recurred since.  I'm trying to avoid being a part monkey and buying a replacement transformer just for the hell of it.  So as of now, all is good.

I suspect it might be some aspect of the transformer.  I did validate the output voltage was 12V and 16V per its configuration.  

Share this post


Link to post
Share on other sites

There may be a cold solder joint on one of the pins where the temperature sensor plugs in on the circuit board.

Brandon@spokanespas.com

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×