No hot water pressure in shower


We have a shower with a single handle. Hot water only trickles out of the faucet or shower head, but cold water works fine. Any suggestions as to what could be wrong. We get hot water everywhere else in the house.
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dgd077 wrote:

I would guess that there is a filter screen somewhere on the hot water that is clogged.
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Joseph Meehan

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You might try removing the valve cartrige, debris can get stuck inside
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http://groups.google.com/group/alt.home.repair/browse_frm/thread/45c67a545614d9e8/0132b59f4b8c9746?lnk=st&q=flush+a+hot+fixture&rnum=1&hl=en#0132b59f4b8c9746 says: to determine how successful you are, write down how many seconds does it take to get a gallon of hot? cold? warm?
you could open up the fixture and flush out the fixture, flush out the debris in stop valves below by opening and closing them with the water running thru them.
here's a trick i used once: if debris is blocking the sink hot, block the sink aerator, close supply to water heater, open hot at the basement washtub, open the fixture to full warm, and backflush the cold thru to basement washtub. no improvement? swap instructions and backflush other line. no improvement? find all valve stops between main and the problem sink. remove and replace debris inside and replace their broken and disintegrated rubber washers blocking the line. if you are still using old galvanized silver colored pipes, the reduction of the inside diameter causing a restriction in flow is a regular battle until replacement.
to determine how successful you were, write down how many seconds does it take to get a gallon of hot? cold? warm? dgd077 wrote:

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If there is a pressure balancing unit (minimizes the impact of reduced flow to prevent fluctuations in temp) it may not be moving, and may need replacing. -g
dgd077 wrote:

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