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How do i fix a code 5 error on a culligan 100 water system?

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What does c5 mean? I can't get it off the digital face and had to by pass to shut off.

Posted on Dec 07, 2013


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Culligan Mark 100 Had code C5 Doe not work. What does code C5 mean?

A lot of people mistake the "S" as a 5. The error dispaly says "CS" which means call service. You probably have a gasket hung up and need a new seal pack.

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My culligan mark 100 soft -minder water softner salt tank overfills

First check the eductor assembly. Top of valve under chrome plate. Pull it out and clean it (after bypassing and depressurizing the system)
If that is OK the the brine piston will need to be replaced. There is a rebuild kit for this series valve that is about $120 that includes the refill piston and a retrofit kit. It would be wise to rebuild the valve.
See your local culligan dealer

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Culligan mark 100 fixed problem I just need to know how to reset the CS code without calling them out.

Just unplug it for several minutes. You will need to reset the programming, hardness, time of day.

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1 Answer

Our system is only running small amount of water through to the drain... system operating panel just says C5! Even after unpluging and repluging it doesn't change. Does the system need repair?

If it is running small amounts of water to the drain when it is in service position this means you have a bad seal pack and it needs to be replaced. The "sealpack" is the main piston and seals that control the hydraulics of the valve. When water runs to the drain constantly either the piston is jammed (which would show an error code) or there is a bad seal causing water to get by. I suggest calling Culligan or if you are handy you can do this yourself. You need a sealpack and refill piston. It takes about 20 minutes. The kit is available from Culligan.

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My waterside watersoftener mc450 Ultra s display keeps flashing

This is under warranty still call Culligan for service. Is it flashing an error code? In the meanwhile unplug the system for two minutes and plug back in, this may reset the controls.

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3 Answers

Mark 100 has a

I removed the control panel and saw that it had a series of dip switches. All these dip switches were all positioned to the same side, this is the way it was installed.

I reset it by flipping all dip switches to the opposite side, then unplugged it for 10 seconds and plugged it back in. The LED the. Displayed something other than the "CS" code. With it still powered, I reset the dip switches to original setting and unplugged again for 10 seconds. When I plugged it back in, I was able to reprogram. I'm sit sure if this is how a service tech would reset the control, but it worked for me and my mark 100 has been running fine since. Good Luck

Oct 20, 2009 | Culligan Sediment Water Filter Heavy Duty

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