A boiler should provide your home with central heating and domestic hot water. Have you tried turning it right down or does it stay the same? The dial can fo lower than 60 (55 I think is the min).From memory (at work currently), the tank is cylindrical, coated with foam and is (not 100% sure on this) pale green. Dec 13, 2011 #1 Apologies if this has been asked before, I did try a search. I have a Potterton Prima F40. I have a 3 zone boiler heat system, one t-stat for each floor. Unlike a combi boiler, cylinders take time to cool down, so wait a few hours before adjusting again. Water going too slowly over the heat exchanger overheats, or you could have a faulty thermostat. We have a normal boiler that feeds a hot water tank. Combi boilers have controls to set the temperatures which could be manual or digital. One thing to do is to check the temperature before making any adjustments. You might hear a whir from the motor in the rectangular box on the 3-port valve.If I am right, the boiler does not have to be opened up (it is quite tricky on your model) and the fault can be fixed by changing the motor head. Don’t confuse the room thermostat with water temperature – they different things. The temperature setting on the cylinder may be behind a panel. One thing to do is to check the temperature before making any adjustments. Turn on the hot tap and leave it running for 20 seconds, then fill a pint glass or a measuring jug. I think your might be this one but I can't see a date. Understanding the components of a hot water boiler can help with basic troubleshooting. Our hot water is too hot and I'm struggling to see how to turn it down. I managed to fix this problem for Father Clarke whilst looking at his boiler and figured this solution might help others who are experiencing a similar boiler fault. If your boiler keeps suffering from breakdowns, constant repressurising issues or getting too hot, then it will likely be because of a more serious problem. The first time I was out of town and my wife called and said the upstairs was very hot. There may be two - one for hot water and one for central heating. The dial on the tank is at 60 degrees, but the water coming out of the tap is much hotter. Too little flow rate OR too much heat input (caused by gas settings). however it seems to be a condensing and modulating boiler so probably fairly efficient, so no need to replace it unless it becomes irreparable. If it doesn't, then have your system serviced and ask the engineer to check out the temperature on the tank. When the water temperature in the boiler becomes too high, it increases the water pressure throughout the system. If your hot water is boiling and running out of the overflow pipe or your central heating radiators are too hot here are some simple checks to make . Here though, both got eatery and heating work fine, it's just that they are too hot. However, gas-fired boilers are fairly reliable and when problems do occur, they are usually related to the expansion tank or water circulation pump(s). For more information call our team on a loca number below:-Plumbers Wigan 01942 417220Plumbers St Helens 01744 776140Plumbers Newton Le Willows 01925 394260Plumbers Warrington 01925 394260Plumbers Runcorn 01925 394260Plumbers Widnes 01925 394260, Santa Says Some Gas Appliances are Unsafe. In order for your boiler to pump hot water around the pipes in your house, whether that be for a bath, shower or to heat your radiators – … This is very important because hot water may cause burns. While they are more reliable than gas boilers, they are not always perfect so from time to time electric boiler users can find themselves with no hot water. Status Not open for further replies. The temperature thermistor could be faulty,a faulty modulating coil on the gas valve could also cause the water to over heat.The flow rate on the boiler might not be adequate and may need increased,11 litres per minute will be adequate,you can check this with a stopwatch and a measuring jug.If you have a hand held thermometer,fill a cup with cold water then measure the temperature.Run the hot … Tap water does not go through the boiler. The heating is enabled, but the thermostat is set to 10% so never comes on. (This is not a joke).Is the heating turned off, and are any of the radiators hot?How old do you think the gas boiler is, and when was it last serviced? If a boiler has reached 220°F, a sudden drop in pressure could cause the tank to burst. A new valve motor that out. Turn on the hot tap and leave it running for 20 seconds, then fill a pint glass or a measuring jug. Hot water is too hot: Cylinder thermostat is set too high: Turn it down – 60°C is the recommended temperature: Loose Cylinder Thermostat: Reposition and tighten up strap: Cylinder thermostat incorrectly or poorly sited: Ensure there is a good thermal contact between thermostat and cylinder – remove dirt or insulation: Cylinder thermostat switch broken The burner comes on, the pump for the It’s also possible that your water is running too hot because of a mechanical or electric failure in your boiler or system. What kind of boiler do you have? If it’s digital, consult the instructions. A boiler is a bit more complex than a forced air furnace in that it has more parts, valves, and controls. Adjusting one shouldn’t adjust the other. The immersion switch has always remained off and unlit.When we used to have the heating on, the radiators were always extremely hot. Just poking a finger into the water from the tap Is not enough! Close to the boiler, or close to the cylinder, there will probably be a pump (probably dark red) and a 3-port valve (brass, with three large pipes going into it in a T shape, and with a rectangular box, probably metallic grey but might be plastic. Use a thermometer to see what temp the hot water gets to if you leave the boiler on all day (though I would not recommend that as normal, since it may get scalding).I am not familiar with your boiler, but it seems to have a difficult reputation and may be older than you think. If you’re suffering from low boiler pressure where the needle dips below the optimal 1.5bar level, we have covered that in our low boiler pressure blog. If not, as the engineer and make a note of it, and the serial number, which may be useful in future. Overheating also is the main cause of leaking. Combi Boiler won't maintain hot water temp. P.s.Just to check, your boiler is a Promax, not a Promax Plus? If your boiler it noticeably quite old or in poor condition then this could easily cause problems with … If the water coming from your faucet is too hot and turning down the setting on an electric water heater thermostat has no effect, the problem is very likely a malfunctioning thermostat. Most people set timers to turn the hot water on in the early morning and in the evening. To comment on this thread you need to create a Mumsnet account. Last serviced about 12 months ago I think (we've only been here 10 months). At the extremes there are only TWO causes of the water getting too hot ! A room stat can also cause the water to get too hot, but is normally protected by a safety stat within the boiler. The dial on the tank is at 60 degrees, but the water coming out of the tap is much hotter. The thermostat is allowing the heating element to remain on too long, heating the water beyond what is … Do you you need hotter water from your Combi boiler, especially on the kitchen sink? Boiler pressure is the balance of water and air in your central heating system; too much of one or the other and it will affect your boiler pressure. Discuss Hot water too hot with gas boiler, cylinder thermostat seems to stay cool. The temperature of hot water depends on what boiler you have, how it’s set and whether everything’s in working order. I can't remember how I got it straightened out over the phone but I did. My Profile My Preferences My Mates. Locate the bleed point on the first radiator usually at the top of the device on one side and have a dry cloth and container handy to catch the water. If turning down the temperature doesn’t work, call a Gas Safe engineer. The temperature of your hot water is regulated by this adjustable thermostat which normally has a range between 90 and 150 degrees Fahrenheit. Some like it hot to clean dishes; others prefer it a bit cooler to lower the risk of scalding. The Water From My Boiler Is Too Hot. This will cause breaks to begin occurring at … The immersion heater is off (never used)Our boiler is a Potterton Promax HE and the only controls on the outside is one solitary reset button. Turn tap control down, then perform the test again. Usually they are downloadable but I can't see their link.The may be an identification plate or label on it, or behind a flap. If manually turning down the temperature doesn’t work, … I had a look at a pic of your boiler, and it does not appear to have a boiler temperature knob, it might be preset temperature, and there is a chance that the setting is wrong or failed. Similarly, your radiators are not the same as the hot taps. It might have its own circuit breaker of fuse in the "fusebox" that you can turn off.Then turn the cylinder stat up and down. No more hot showers to soothe those tired aching bones after a hard day of labouring. The room stat. 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