If a boiler has reached 220°F, a sudden drop in pressure could cause the tank to burst. raden 2006-01-28 21:51:07 UTC. Details. A combi boiler that cannot regulate the flame down sufficiently would produce too-hot water when the inlet water arrives above a certain temperature. It does not take the heat exchanger long to reheat this small amount of water back to the thermostat’s temperature setting which is why the boiler quickly turns off again. Permalink. Trailer Mounted Boilers. Their purpose is to release any excess pressure and prevent your boiler pressure from rising and becoming too high. The simplest boiler control is the on/off switch. The hot water already going through your radiators will continue to heat your home as it’s already been heated by the boiler. The boiler has been regularly serviced and maintained. Boiler will not switch off when required temperature is reached. Post by Cicero. After the gas supply has been turned on everything is fine. Previously, our thermostat was keeping your boiler on until your home reached the right temperature. Before you spend a large amount of money on experts and equipment, consider that the problem might be as simple as replacing the thermostat. 2. Post by raden . Not turning the water supply off will cause cold water to enter the boiler and turn into steam once it reaches the overheating unit which, in turn, will cause the pressure to rise to dangerous levels. This is, however, the way heat pumps are designed to operate. I have had enough of the Screwfix admin screwing everything up. Once the water supply has been turned off, a Gas Safe registered engineer will be needed to diagnose and fix the problem that has caused the boiler to overheat. Before pressing these buttons I switch off the boiler. My combi boiler goes off 4to5 minutes of being on. The Fix: Firstly, turn off the boiler so you don’t draw any more air into the system. Operating this way is not good for the boiler lifetime. When your thermostat hits the target temperature you’ve set it tells your boiler to switch off. You shouldn’t need to adjust these output temperatures as you may alter the boiler’s efficiency. Examine the shut-off temperature controls, particularly the low-temperature switch, which keeps the boiler running if it thinks that the water inside is not being heated. Customer reply replied 3 years ago. Turning it on puts the boiler in standby mode until it needs to provide heat for your hot water or radiators, for example because you have a thermostat and the room is cooler than the say temperature. The boiler would cycle on and off producing too-hot and then too-cool water. Thermostats can grow old and outdated and read the wrong temperature, which sends the wrong message to the furnace. Refocus on main menu Refocus on main menu Boilers Combi Boilers ... Finance options are offered subject to status and credit check which must be completed before commencement of works. FastTrack your boiler installation. Boiler cuts out before getting fully hot (too old to reply) Honeymonster 2006-01-28 12:59:22 UTC. Stat is sending on/off commands when it is supposed too. The temperature shown on the boiler display very quickly drops back to the 30 or so degree level where the boiler cuts in again. kevin eastwood on 12th December 2016 at 1:07 pm Hi there, I have a ideal isar he30, just replaced the trap after being blocked up with sludge, my new problem is the boiler seems to be ignoring the thermostat. When the water temperature in the boiler becomes too high, it increases the water pressure throughout the system. The boiler will cut out when the water in the pipes reaches a set temperature too, not just when room-stat says so. When a boiler short cycles, this internal thermostat detects that the water in the heat exchanger is cooling and, although the temperature in your home has not dropped, fires up the boiler to reheat the water. On turning tap off shower goes hot for about 30 seconds then boiler cuts out for a few seconds then fires back up. Call your engineer out to take a look at your boiler pressure release valves or vents, as they could be the culprits, if they aren’t doing their job correctly. One Corgi registered engineer said the problem was with the pump set at too low a speed, this was increased but the problem has not gone away. When the thermostat is not performing its duty, this, in turn, keeps the furnace from performing its duty. Post by Fentoozler. For combi boilers, the recommended output temperature for the radiators is 75 °C and for the water it’s 60 °C. Now, ... as it may require flushing or cutting out and replacing any faulty pipework. Ideally, boiler maintenance should be carried out a little before temperatures start to drop,so around September or October so as not to have to turn the boiler off in the middle of winter. 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