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My rads come on when i turn the hot tap on for a shower.even when the central heating is turn off?can you please tell me why.thank you

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  • Contributor
  • 21 Answers

Suggest the heat exchanger may be furred up inside

Posted on Apr 13, 2015

6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Combi Boiler - Running warm & then cold!? HELP!

mixing valve must be replaced

Posted on Nov 02, 2008

  • 3 Answers

SOURCE: combi cutting out and overheating

is this a baxi 105? chances are you diaphragm has gone on your diverter valve. Or your diverter valve.
Do you will initially get a liitle hot water if your heating is on?

Posted on Dec 30, 2008

gary1121
  • 332 Answers

SOURCE: Central heating and hot water have suddenly stopped working

not an engineer but maybe a heating compant,, it sounds like you have a relay that has gone bad, you have what we call a winter summer system your domestic water comes from a tank inside the boiler, you might want to think about splitting the system to save you some money in the long run, seperate the water heater from the boiler so you only heat up in the winter, right now you are heating the system that heats your house to get 30 or 40 gals of domestic hot water, it would cost you less by seperating them

Posted on May 30, 2009

gary1121
  • 332 Answers

SOURCE: easiboost power shower - problem

it comes on when the pressure changes so when you open another faucet it changes the pressure and makes it come on,, check your pressure regulator valve on the main line comming into the house it has a screw in the center, if you have a pressue gage put it on either the water heater drain or out side hose bib , check the pressure when turning water on and off if it changes more then 5 lbs you need to change your prv valve. pressure regulator valve,

Posted on Jun 06, 2009

  • 4 Answers

SOURCE: low pressure on hot water taps and showers

Many states building codes require a pressure regulator and expansion tank for hot water heater installation. Check the pressure regulator if you have one as this would only affect the hot water pressure. Adjust or replace. Rap the expansion tank like knocking hard on a door. Hollow sound is good. Dull thud means it needs to be replaced as it is filled with water.

Posted on Jun 24, 2009

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1 Answer

My central heating turns off when i turn the hot water tap on. when i turn it off the central heating doesn't come back back on until i turn the power off and on.


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Feb 09, 2016 | Water Water Heaters

1 Answer

When I have central heating on, why do I also get very hot water in taps even though water heating switched off?


This could be due to incorrect installation, incorrect wiring of controls, or an unintended consequence of combined central heating and hot water supply.

Nov 27, 2015 | Water Water Heaters

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I have to turn the hot water tap on full open to get hot water


Type of water heater is unknown
If you have single-handled faucet the faucet cartridge might be bad.
If you have recirculation system, then check valve might be bad.
Copy following links for troubleshoot.
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

Jul 16, 2012 | Water Heaters

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I have a thermostat mixer shower but hot water has become minimal recently, even when water is piping hot from the taps? The shower is fed from cylinder tank on 1st floor, and cold water tank is in the...


The thermostatic mixing spool cartridge may be worn out. The low water pressure may indicate sediment in the cartridge as well. This can be easily removed by hand tools

Feb 17, 2010 | Grohe Integrated 1/2'' Shower Thermostatic...

1 Answer

Heatslave diverter valve


clicking rads are due to pipe expansion when getting hot.
If the hot water [secondary circuit] gets hot and the boiler stays on [does not keep going on and off] even with a constant low water flow then the diverter should be ok.
there is a valve to prevent the primary circuit [central heating] [ CH] from sending water to the rads. this or its control may be at fault.
both the
Both the CH pipes to & from the boiler should have manual valves to turn off. do this then try the hot tap-full on. If the boiler goes into overheat mode and the overheat stat kicks in to turn the boiler off -- then :-
Check also the heat exchanger, it may be furred up especially if you are in a hard water area. It means taking it off and manually checking [pour water through] If you're lucky it will be just muck to be forced out with hose pipe pressure, if not a new one

Sep 06, 2009 | Water Heaters

2 Answers

No hot water when heating tempreture reached.flow switch is operating, power at flow switch terminals on pcb (three wires),? but when working hot water runns for ever and heating runs ok too untill the...


I have a triton opal shower.

I turn shower on low pressure and cold water. then no low pressure and piping hot water for a very short time then low pressure and cold water.

I've changed the solenoid and the little black plastic ball.

Help !

Aug 21, 2009 | Water Heaters

1 Answer

Vaillant ecoMAX 828/2boiler goes on & off when running hot water!


water must be set at 3lts a min ,check diaphragm valve move when hot tap is on, check microswitch ,best of luck

Aug 09, 2009 | Water Heaters

1 Answer

A trickle of hot water from taps, central heating ok


it sounds like your shut off valve might be bad even though it turns on and off by turing it doesn't mean that the washer is not stuck to the seat and not opening, try replacing the valve

May 18, 2009 | Water Heaters

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