New shower valve only hot water

hello,

I don't get this one. New Grohe Valve, Tempra 4000:
http://www.grohecatalog.com/product/35099/

I installed the valve, opened the stop valves.

This valve supplies shower and tube with diverter. Opening the vavle counter clock wise should initially get me cold flow, warm and then hot.

I get less than a tricle of cold flow, basically nothing, until I get the dial into the hot, then I get a good bit of hot only but not as much pressure as I expected.

The only thing I can contribute an irregularity to would be when I had to re-sweat the joint at the hot water in side, where I had to heat the joint up in order to tighten the threaded "in" side...so I dunno if that had anything to do with it.

So to sum it all up, valve has supply but doesn't deliver any at all.

Thanks for any help, I'd sure appreciate it.

Josh

follow-up

I worked up the nerve to shut the stop valves and take out the cartridge. Pretty simple thing. The cold inlet side where the greased o ring sits was crammed with debris.

There is no, repeat no screen in this unit, so, some debris is allowed to pass. Larger particles completely blocked the unit and so: no water.

I put it back in and it promptly stopped up again. I took it out, tehn lost a screw down the sink, a trip to the hardware is what I'll do now.

Obviously what I need to do is remove the cartridge and let the water flow till all the crud is passed.

Two concerns:

Looking at the cartridge inlets surrounded by the o ring on either side, there is a white plastic nub that block the inlet. The one at the hot water is completly seated (blocking the orifice) the cold side is open with the nub recessed into the valve body. What is this, what does it mean.

Second, how should I/shoud I attmpt to flush the cartridge? If so how?

Thanks, Josh

I'm not a plumber; please indulge my reply. I wonder where the debris is coming from?

how should I/shoud I attmpt to flush the cartridge

Click to expand...

Close stops. Remove cartridge. Open stops & stand back. I was lucky -- my Moen valves were just the right size so I could fasten a short length of bilge pump hose on to it and direct the flow down the drain. Debris can come from anywhere, built up over time or introduced when installing the plumbing, or naturally occuring in the water supply.

Close shower door / secure shower curtain as good as possible and let 'er rip! Set up a makeshift diverter (plastic sheeting rolled up over the valve and secured in place with a band or tape the heck out of it with duct tape.... use imagination. I'm sure someone will have a more professional answer but I've actually done all of this with really decent results.