Radiators commonly have two basic reasons of being heated while the central heating is off. If your central heating system works perfectly yet there is no hot water it means that your hot water works but only when your system is working and you need to clearly look upon it. If your central heating is functioning perfectly but there is no hot water coming from your shower or taps, it is likely an issue with the diverter valve. when i switch it on hot water only, nothing happens when i turn a tap on. This started only recently: - Switching heating on the thermostat in its own does not ignite boiler and provide heating - When switching on Heating is followed by switching on Hot Water, then we have heating working - Even if leaving BOTH Heating and Hot water ON together, after around 15 minutes heating … We still have a Baxi Bermuda with the 2 tanks in the loft and a hot water cylinder upstairs, but the radiator system is pumped, with a motorised valve which cuts off the radiator circulation when the switch on the downstairs timer is set accordingly. I never had any problems for example running a bath of hot water but it only comes out warm now so I use the shower more. The heating works fine and the boiler is firing when you run the hot water taps, but I only get lukewarm water if the taps are running at what I'd consider a sensible pace. The heater is normally turned off, but is equipped with flow sensors which activate it when water travels through them. Other indications of a faulty diverter valve may include: No hot water when you open a hot tap, but the central heating works normally. The Hot Water works perfectly on its own. Hot water from the boiler rises and flows by natural … If you have this type of installation (gravity circulation hot water circuit WITHOUT a hot water control valve), your Installer should have restricted the ST9400C Programmer to be a Mini … It only heats the tap hot water when the CH is on. So if the kids want a bath we have to turn the Central Heating off, or the hot water tank stays resolutely cold. In industry, hot water and water heated to steam have many uses.. Domestically, water is traditionally heated in vessels known as water … Some valves the mechanical head is replaceable- 20-30 … A thermostat issue would only cause an issue with heating, rather than hot water. The Central Heating works perfectly on its own. The 2nd gen Nest Learning Thermostat does not control domestic hot water. A negative feedback loop is used to bring water to the target temperature. Sometimes one valve, sometimes two. If the water flowing from the hot tap is not that hot, it doesn't necessarily mean that the water is not heating at all. Why does my HOT WATER only work when HEATING is on. There is a high bleeder valve on the return side, which I have opened expecting water to come out after the air escapes. paul February 2010: There is more help available. Really irritating when there is six inches of snow outside. There are 2 two port valves. Malfunctioning check value- The older types of heating systems operate to keep the water hot all the time. btw, it is a gas fired boiler Installed Nest 3rd Gen. All works well when heating on but concerned about hot water. Absolutely no heating of any radiators when set to hot water only. Yesterday however when I went to put the Central Heating on, it wouldn't come on. When the CH is off or turned down there is no hot water. It is therefore NOT possible to have independent programmes for heating and hot water, so it is only necessary to enter one time programme. But if you try to run both together only the Central Heating works. In this case it could clearly be an issue with the diverter valve that might be faulty or be stuck in the central heating position. I have established that my hot water only heats up when the radiators are in operation. All has worked fine until recent spring weather means the (thermostat controlled) central heating hasn't been coming on. Operation. Cost to fix (and get your hot water back): DIY: £0.00 Just had the water pump replaced, does this need another visit from an engineer? I have oil boiler y plan system hot water tank is open ( filled with header tank) if I press boost on phone app for water only boiler fires up then stops immediately. Oil-fueled boilers and heating systems are popular in areas where there isn't ready access to natural gas. But if your thermostat is also acting as a timer, a fault with it might cause your boiler to shut off entirely, also starving you of hot water and plunging you back into an age so dark you feel blindfolded. Your boiler will have separate controls to turn on the heating and hot water. If your hot water valve is not opening or only partially opening you will get limited hot water. Hot water works ok, but the central heating only works while the hot water is on. Hot water is something we tend to take for granted and expect to be available when we need it. Hello just found your post while searching for problem. There is enough hot water for the heating to work. We have a dual zone system. I have been trying to get the hot water to work without the central heating I think once it did work separately but can't be sure. Since there is no finite tank of hot water … It's set to come on, the room thermostat is up enough to come on, the wireless receiver has the green light to say come on but it's not on. Hi - I wonder if anyone can help. I have taken off the control valve motor and manually turned on the station that does not work. This valve allows a combi boiler to switch between heating your radiators and your hot water, so when you turn on your hot tap, the diverter valve opens and sends hot water to the tap. This valve controls whether the boiler heats hot water for the taps or the radiators. 0 Recommended Answers 1 Reply 0 Upvotes. Let’s have a look. If I have the heating on I don't have this problem. 1 Only the models listed in the table above can control hot water. I have a boiler with a hot water tank and an immersion. That’s okay, though, for the off-peak hot water heating system is still stockpiling energy. Hive Active Heating 1 thermostat: via the < button Hive Active Heating 2 thermostat: via the 'Menu' button Control of your water temperature is not supported by Hive Active Heating. Sometimes a certain malfunction could occur and prevent the water from heating enough before it exits the faucet. I think it is an issue with combi-boilers. Why does the hot water only work when the central heating is turned on.The central heating summer/winter switch is on water and heating at the boiler but as soon as the heating is turned off on the dial in the house the water is cold. The most common by far are the 22mm 3-port, 5-wire, mid-position valve and the 22mm 2-port, 5-wire, zone valve. So, come the summer months there will be no hot water. The water circulates through a copper heat exchanger and is warmed by gas or electrical heating. A relatively common fault with boilers sees the central heating work with no hot water. However, if your boiler is cutting out and the hot water is only getting lukewarm – … Water does not come out. 12-15 psi on the system. When you turn on the hot water and your boiler fires up to heat the water, it should stay running the whole time the tap is turned on. These 22mm valves (3-port … Evening, My thermostat says it is heating when I turn up the thermostat but doesn't actually turn anything on unless my hot water tank is turned on. When heating and/or hot water is called for, the powerhead motor turns the valve to the appropriate position, and in doing so operates the microswitches. 2 Look for the OpenTherm logo on your boiler, or contact your system’s manufacturer and ask about your model. You can usually set the temperature of the hot water … but this is only for a short while, until the tempreture reaches its highest level, then no more hot water through the pipes. However, as the pressure drops, the boiler switches off and stops heating the water. On the controller there are two long switches if i put hot water only on, constant to test but it same for on twice, no hot water comes. When hot waters need to be sent from the boiler to radiators instead of the taps, for instance, the tap diverter valve will close. If someone turns on a tap, hot water flows, but now the electric elements ignore the need to replace the lost energy; they’re waiting for the night hours to spin back around again. Typical domestic uses of hot water include cooking, cleaning, bathing, and space heating. All other zones seem to work fine. If you still have no hot water or no heating after checking the above steps, then you will want to check that the boiler settings are correct. Radiators hot when heating off combi boiler. Learn more about how the Nest thermostat works with … Cannot ask original installer as he is retired so am thinking of using Potterton's after sales HeatTeam. Diverter valves open and close to allow or cut off hot water that flows through your heating system and radiators. You can turn your hot water on or off, set a schedule or Boost it, which turns the hot water on for 1-6 hours. There are various designs of this system. today after speaking with you, it appears that when hot water is turned on via Hive, the heating radiators warm up slightly as well as the hot water, which is only getting luke warm and not getting fully hot … i only get hot water when both central heating and hot water are switched on. Mick you cursed it lol, I swear the hot water was working properly via the Hive since Tuesday, (all family members have had several showers since!) To get the water hot enough say to fill a bath you have to fart on with the tap to get the water to run slow enough to actually stay hot, but fast … In some cases – such as with broken diverter valves – the hot water will only work when the central heating is fired up, whereas in other cases, the hot water will not work … Radiators getting hot when you open hot taps. This is a similar concept to bathtubs that have a showerhead in addition to the normal taps. Water heating is a heat transfer process that uses an energy source to heat water above its initial temperature. Heating only works when hot water tank is on. I can run off at least a washing-up bowl full of water before the hot water comes through. It is possible that the hot water or heating may have been set to off by mistake, or the setting has been inadvertently … If the powerhead either can't turn the valve (because it's jammed), or has burnt out, the microswitches don't get operated, and the pump/boiler never … I can force the boiler to start heating the water again by turning the tap on some more, but at this point I'm pouring quite a considerable amount of water down the drain. If you have a combi-boiler, you’ll be used to having on demand hot water day and night, whilst those using a conventional or system boiler will know when to expect a supply of warm water to be available for bathing, showering or washing up. They also allow the homeowner to use renewable fuels and some companies are even offering mixes of heating oil and biodiesel, which produces less pollution than heating oil alone. Having to turn on the central heating in order to get hot water from hot … Are having problems with our Potterton Performa 28 CHB. 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