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Old 05-12-2013, 13:48   #16
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Re: Norcold SCQT repair?

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Originally Posted by azsailor12 View Post
I also have a 4407, but fortunately it's working. The Thetford website has some documentation and spare parts list. It appears that all major assemblies are still available.
Thats good news. Hopefully once I overcome the original owner's mistakes on the installation, I hope mine will work for years to come. I really like the design and concept.

Regarding the Thetford site, that was the start of my frustration. The few documents that are available had discrepancies or gaps in information. Not too uncommon, but when I called them for clarification they could not answer my questions, stating that they "did not have a technical support person"... Wow, really???

In calling a couple of dealers, they too expressed frustration and commented that it was hard to price replacement parts for these systems since they are really not intended to be serviced. Grrrrr.
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Old 05-12-2013, 14:09   #17
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Re: Norcold SCQT repair?

azsailor12, I do have one question that you may be able to comment on if not too much trouble.

I have a control box from an old Norcold SCQT-6407 which is a predecessor to the 4407/4408 systems. It has a knob to adjust the temp, an ON/OFF slide switch, and one LED - pretty simple. I was hoping it would be compatible, but it has 4 wires into a plug, whereas the one for my 4407 needs 5 wires. I hope to learn why the newer 4407/4408 systems needed the additional wire.

My question is whether your control box has anything more than a knob, switch and LED?

Also, if anyone has a dead 4407/4408, I am in the market for a used control box, as well as a set of male and female quick-connects.
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Old 05-12-2013, 14:42   #18
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Re: Norcold SCQT repair?

An interesting breakthrough - I found a Norcold document on-line that includes a wiring diagram for the old SCQT 6407. Bk and Bn wires are to the ON/OFF switch, Yellow and Red connect to the resistors and variable resistor for adjusting the temp.

This document is much better than what I have found for the 4407/4408, which is what I really need.

Still, if I have to guess on mine, I'll at least have this as a means to make a SWAG. It still bothers me that I don't know what the Orange wire does.
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Old 06-12-2013, 12:38   #19
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Re: Norcold SCQT repair?

Oh well, the wiring info for the old SCQT 6407 did not get me anywhere.

I was hoping that crossing the Bk and Bn wires would result in the compressor and fan kicking on, but no luck. Apparently the orange wire and/or other wires also need to be connected.

A quote for a thermostat, part # 1601-140-40 for my SCQT-4407 wasn't as outrageous as I had feared so I decided to take a leap of faith and order it from S & S RV Svc Center in Gettysburg, PA (717-334-0149). I hope it works out. I was very impressed with the reviews on S&S - very high praise. They were the only dealer that seemed to be interested in helping me and could find the part to be able to quote it. My impression was very positive.
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Old 25-04-2016, 09:25   #20
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Re: Norcold SCQT repair?

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Originally Posted by mashenden View Post
It is worth the time/effort IMHO given the unit was damaged during its initial installation, meaning the compressor unit has 0 hours.
I realise this thread has been sleeping for 2.5 years but something happened today that made me google "Norcold SCQT-4407".

I visited my little local marine shop today and spotted a Norcold SCQT-4407 on the window. Having had incredibly bad luck getting a boat fridge kit here to the booneys in the past I was naturally interested. I talked with the guy and he told me that he has TWO of those units. Both USED. Both are customer returns under warranty and the other unit only was ever switched on for a day and a night but never produced any cold. His price for the evaporator plate only was 1000 ringgits (about 250 USD) and he would throw in the compressor as well. Norcold do not want these faulty units returned to them, they just ship a new unit to the customer.

At this stage I got really exited and thought to myself omg, I'm gonna snatch that set and fix it up. But then I thought to hold my horses and do a bit research first. And OMG. Google search shows plenty of problems with these units. Not just on this forum but on other ones as well. Or is it just that people only write about disappointments? But it did not appear to be uncommon for these to never work out of box or failing relatively soon, like after a season or two. Are these really so bad? If I paid 1K for a similar kit I would want at least 10 years of service out of it. (Nowadays WM price for the newer 4408 is 700 plus).

Mashenden, were you able to repair your unit? If yes, what did you do? Did you find out what that fifth wire was for?

This question goes to everyone: is it really so that one can not add gas to these? Can not retrofit valves and use a gauge set and vacuum the system? I am no expert but I am under the impression that one should vacuum the system before adding gas?If adding gas is no option then I don't know if these can be made to work after they have been connected and disconnected once. Anyone knows?

Thanks,

Erik
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Old 25-04-2016, 14:23   #21
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Re: Norcold SCQT repair?

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Originally Posted by ErikFinn View Post
I realise this thread has been sleeping for 2.5 years but something happened today that made me google "Norcold SCQT-4407".

I visited my little local marine shop today and spotted a Norcold SCQT-4407 on the window. Having had incredibly bad luck getting a boat fridge kit here to the booneys in the past I was naturally interested. I talked with the guy and he told me that he has TWO of those units. Both USED. Both are customer returns under warranty and the other unit only was ever switched on for a day and a night but never produced any cold. His price for the evaporator plate only was 1000 ringgits (about 250 USD) and he would throw in the compressor as well. Norcold do not want these faulty units returned to them, they just ship a new unit to the customer.

At this stage I got really exited and thought to myself omg, I'm gonna snatch that set and fix it up. But then I thought to hold my horses and do a bit research first. And OMG. Google search shows plenty of problems with these units. Not just on this forum but on other ones as well. Or is it just that people only write about disappointments? But it did not appear to be uncommon for these to never work out of box or failing relatively soon, like after a season or two. Are these really so bad? If I paid 1K for a similar kit I would want at least 10 years of service out of it. (Nowadays WM price for the newer 4408 is 700 plus).

Mashenden, were you able to repair your unit? If yes, what did you do? Did you find out what that fifth wire was for?

This question goes to everyone: is it really so that one can not add gas to these? Can not retrofit valves and use a gauge set and vacuum the system? I am no expert but I am under the impression that one should vacuum the system before adding gas?If adding gas is no option then I don't know if these can be made to work after they have been connected and disconnected once. Anyone knows?

Thanks,

Erik
Yes, I got mine to work. Mine did not have gas or functional lines between the compressor and plate when I got it, so I added T valves into the design because I wanted to be able to attach gauges and to service it moving forward. While they are designed to not be serviced, there is no reason that they cannot be, other than I guess they would rather sell you a new unit

It took quite a bit of tinkering for me because of the lines (mainly the cap tube length), but if you have the compressor, plate, and all of the tubing between looks in good shape (presumably with the reusable connectors), I suspect that if you installed a T connector on each side, pulled a good vacuum, added gas SLOWLY until you see frost appear on the plate, then keep adding little bits until the frost gets to the top of the plate, you will have a working system.
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