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The electic shower keeps going cold for a few seconds then hot

Our shower has started to run cold for a few secomds then will run hot. I have turned the hot water up on the boiler and checked the pressure all seems in order
The boiler is a RAVENHEAT. I dont know what make the shower is, its fitted over the bath, but all you can see is the on / off dial knob type switch, and a similar and the same kind of dial for the temp. The Shower was in when we moved in.

Any ideas what I can do before I call a Plumber.

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I have a triton trance 2nd generation electic shower that is a couple of years old when you turn the flow on it comes out red hot but as you increase the flow it gets colder as flow is increased what is...

Is it possible to have plumber come inspect? Warranty from purchase place? Since you don't sound you put it in I'm guessing a plumber did? It would've been new to him for the most part and he may have hooked something up wrong? You CAN DIY but realize that we're talking electric AND plumbing here. I'm thinking since it heats up the electric is fine. But check your man's work to see if it's got the 30-45A fuse on a dedicated circuit.
1.While out ay elect. box turn OFF by removing fuse or switching to OFF. Test unit that it only runs cold water.
2. Find shut off for water. Sometimes you have to shut off whole house! Hopefully somebody added a shutoff. Look on backside of shower for a 1'x1' hatch covering with a cold and hot valve. Turn water off. Test unit to see if it runs.
3. Now use the manual below and get in there and see if its hooked up right. Go slow and take your time. Retrace the install instructions.

Best wishes. Wear nitrile gloves for peace of mind!

DON'T do it if you're not aware of the electrocution issue. Water all over your bathroom (loo?) is one thing, a 230v shock is another!

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Moen single handled shower the hot water turns cooler then cold after a minute

Your whole house is likely plumbed wrong so that it is impossible to have equal pressures of both hot and cold at your shower. If you had your home plumbed with aquapex using a radiator for the hot water and a radiator for the cold water and have the radiators fed with a 1 inch line you can have close to perfect pressures.

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Hansgrohe Ecostat (with part 94282000 thermostat). Shower runs fine for a few minutes then boiler shuts down and shower runs goes cold. Boiler starts up again after 30 seconds and runs fine for a few...

Check the 94282000 cartridge for debris on the filters. If your boiler requires a certain flow rate to come on, then you must get enough flow through the cartridge to make that happen. Also, if your boiler is producing very hot water, the cartridge will self regulate and reduce the hot flow accordingly. try lowering the output temperature of the boiler to resolve that possibility.

If you need further assistance, you can call us direct at 800-334-0455

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My Bristan Meridian Show start ok with hot water then after a few minutes the water runs cold. Even if you try and increase the temp it still remains cold. You can switch of the shower and start again...

It sounds like 1 of 2 things to me. I will start wit hot water heater. The first test for the water heater is to have someone run the hot water while you hold the hot and cold pipes and see if the water is coming out of the water heater cold when the shower goes cold. Of the water heater is cold coming out then the problem is in the heater. ether a lower element is bad or the dip tube is broken at the top of the tank. if the hot water heater continues to put out hot water when the shower goes cold then it has to be the mixing valve for the hot and cold mix at the shower and that valve will have to be repaired or replaced. hope this gives you a good start. let me know if I can help further.

Dec 24, 2010 | Shower Hardware

1 Answer


I can think of a few possibilities. 1) Something is blocking the hot water in to the mixing valve. Fixing this would probably mean cutting out the valve (then redoing the water lines with a new valve (possible option)).

2) The hot water line is losing too much heat going to this second faucet. (If the two tubs are on different floors this is more common. Many places are plumbed with one line with Ts to all fixtures.) Insulating the water lines might help; alternatively an point of use water heater would help.

3) The hot water and the cold water in are reversed. (Test by leaving the water on full cold and full hot for a few minutes each.) If you get full hot when it should be cold, valves with a cartridge are easy to fix. Open the valve assembly, remove the cartridge and reinsert it after turning it around (side closest to you when you removed it goes in first). Otherwise, the incoming plumbing needs to be redone at the point where the cold and hot lines come into the shower.

I hope this helps.

Cindy Wells

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Check the hot water flow at the shower - if it's as good as other taps the boiler diverter valve is suspect. Replace either the complete valve or the internal rubber diaphragm, depending on the boiler make

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My shower ok for mins, then cold, then after 5 min too hot

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It sounds like the seals are going bad. Moen is probably rebuildable. You can go to a Menards and ask if they have the replacement guts for your particular model.

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