My cartridge is clogged

is hot water pressure low at all faucets..if so, suspect a clogged or faulty hot water heater.

1) Clogged pipe?
Bad faucet cartridge?
Take apart pipe at shut off and see if there is water.
http://waterheatertimer.org/Low-hot-water-pressure.html

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If water pressure is low on hot side, then there is sediment or clog in pipe or water heater.
http://waterheatertimer.org/Low-hot-water-pressure.html

If pressure is good, and shower is single-handle, then shower cartridge is bad.
http://waterheatertimer.org/Crossover.html

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Check the hot water shut off valve, when the washer fails sometimes the valve itself sticks closed, and sometimes the washer breaks up and clogs water passageways down stream...
To test, pull the hose off of the hot water shut off valve, open the valve and see if you have water flow. (route hose into a bucket, you need more that a small amount of water.....
If you have good water flow from the shut off valve, then you likely have a particle that has lodged in the passageways of the faucet. Reverse flow with air pressure and see what you get out....

sounds like you have trash in hot side of value or cartridge...shut off water remove cartridge....check for trash....turn on water slowly to clear lines...may take 2 people to do this 1 to turn water on while other sees if water comes out both ports in value....look in cartridge to see if any clog....if you can get a bucket of soapy water before hand and wash cartridge under soapy water...reinstall and check....if water comes out off both ports without cartridge in...when you reinstall after cleaning it still no flow...you may need new cartridge,,,good luck

I just spent a week wrestling with a similar problem, and I'm posting in an attempt to save someone else an ulcer. Using a Colony single-handle valve, the temperature got so we couldn't control it. Either all hot or all cold. I called A.S. and they sent a new pressure balancing cartridge and new valve cartridge. Replaced both and then there was no water at all coming out of the shower head. Tried every possible combination of old and new parts, flushed pipes, etc. Finally took the shower head off and found it completely clogged with debris. It was a mix of sediment and the white grease that was in the new cartridges, which must have been displaced when I started messing with it. And it clogged it all at once (no flow problems before all of this). Works fine now!

You have clog in the water line.
Since all hot water pipes are involved, clog is probably near water heater.

Buy pressure gauge at hardware store that threads onto hose connection.
Brady BTG 100 at Amazon
Picture of gauge

Check outdoor pressure for baseline pressure in your home.
Turn off electricity to hot water heater for an hour or two so there is not scalding water.
Open drain valve on water heater to see if water heater is clogged with sediment.
http://waterheatertimer.org/Water-heater-will-not-drain.html

Put pressure gauge on drain valve and compare with outside pressure.
Open hot water spigot on bathtub and see if tank pressure drops ... if tank pressure drops significantly with bathtub spigot on, then clog is on incoming cold water before tank, and could be on outgoing hot water pipes too.
If tank pressure stays about the same, then clog is on outgoing hot water pipes.

Clog can be sediment caught in cold water shut off valve located above tank. Open and close valve and test pressure again. Take apart incoming cold water pipes above tank and check for sediment. Replace valve. Look at condition of cold water nipple on top of tank.

Sediment caught at hot water elbow near tank.
Sediment can fill up old pipes. Take apart hot water pipes above water heater and see condition.
Look at condition of hot water nipple on top of tank.
You may have to take apart pipes up to first or second elbow.

Pipes can decay at joint where copper pipe connects to galvanized pipe. Check for copper to galvanized connections on cold or hot pipes and replace section of galvanized pipe. Copper pipe will probably be good, the galvanized pipe will deteriorate. Replace copper-to-galvanized joint with 3/4" non-conducting union from hardware store

It sounds like two problems.
Problem 1) Clog inside faucet or clog inside pipes at faucet
Remove supply tubes leading to faucet and see if problem is inside pipes or inside faucet.
My bet is clog inside faucet.

If you have galvanized pipe that meets copper pipe, this can be trouble spot.
Article on clogged water pipes at Inspectapedia:
http://www.inspectapedia.com/water/Water_Pipe_Clog_Repair_Guide.htm

Article on clogged pipes:
http://www.waterheaterrescue.com/pages/WHRpages/English/Troubleshooting/Tanklets/backflushing.html

Problem 2) Water heater leak ... you say tank valve is leaking? Is that cold-water shut-off valve? Or tank drain valve? Or TP valve?

If cold water shut-off is leaking, then replace shut off.

If tank drain valve is leaking, then check if plastic valve is cracked. If drain valve is cracked, then replace with a brass valve from Home Depot. If plastic valve breaks off, then use hammer and screwdriver to gently chip out the broken plastic valve. New valve threads need teflon tape to seal pipe. If valve is just dripping, then put garden-hose cap over end of valve and screw down tight.

If TP valve is leaking, then replace with same temperature and pressure rating. New TP valve threads need teflon tape to seal pipe.

Problem 3) If pressure is low all over house:
Buy pressure gauge at hardware store that screws onto hose connection.

Test pressure on outdoor spigot.
Open faucet and check if pressure drops. This says if problem is inside pipes that enter house.

Test pressure on water heater drain valve.
This says if pressure problem is before -or- after water heater.

If problem is before the water heater, then shut-off valve located on cold water line is suspect.
If problem is after water heater, it could be in hot water outflow pipe on top of water heater, or a nearby elbow.
Remove hot water line leading from water heater and check pressure. This says if problem is where hot water leaves tank.
Read articles above about clogs inside water lines.

The problem is that when you disturb the galv. pipes, the gunk inside breaks loose, and travels to the faucets, gets stuck, and limits the volume of water that comes out.
If possible open the lines at the service valves, and force water through the spigot to fluch out the faucet. The service value could also be partially clogged, keep that in mind

it is temp contrl shower and you could have to take out the cartdrige and change it,, probly clogged and it's not letting the hot water be hot enough, if the pressure is good then the cartridge is bad