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Re: low pressure on Delta 1400 series shower head
The Shower Valve is regulated to give only 2.2 gallons a minute. If you have the shower head off test how many seconds to get an approximiate gallon running in the middle hot/cold position. If longer than 30 seconds either the stem in the valve is clogged or the water lines to the valve are too small or kinked.
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Positemp cartdiges should deliver years of maintenance free operation. Usually, clogs develope downstream from the cartridge. If the cartridge still works well, that is, if it still pulls and turns freely, and the rest of the house has decent water pressure, check your shower head. Remove the head and test the water pressure. If the water flows better without it, you may have a clogged shower head. Over time, rust and scale can build up inside the shower head and block what would otherwise be decent water pressure. If a visual inspection does not yield any visible blockage, you can consider cleaning the head by soaking it in a calcium removing solution such as CLR. This often helps, but my preference is to replace the shower head completely.
--Hope this helps.
The problem is most likely the seats and springs. You should purchase Delta Part # RP4993. I found some for mine at Lowe's for around $4.00. O-rings are available there too for about $2.00, and you probably should go ahead and replace them as well, especially if they feel dry and brittle.
You have to remove the handle, then unscrew the brass ring (or bonnet) with a pipe wrench, then just pull the cartridge straight out. Separate the lower cartridge from the upper by twisting a quarter turn to the left. Once separated, remove the black rubber seats and springs and install the new.
You must of turned off your water to the house or maybe it was turn off in the street recently because it sounds as if you have debris in you strainer remove the head and rise of removing any dirt rise out both front and back of shower head while head is off run shower to make sure you are getting full pressure out of the pipe that the head is connected to
take handle off and adjust the nylon set ring it is to prevent kids from getting burned and is probably set wrong youll see teeth and a pointer just pull it out a little and turn it in the oppisite direction then push back in
Replacing the cartridge should solve the problem, the balancing spool is stuck, replacing it will solve the problem. The valve should look like this http://www.moen.ca/shared/pdf/3170pt.pdf . I have unstuck the spools in the past, soaking it in white vinegar will help to remove build up.