Thats not uncommon as these appliances will pull available water from your system and thus change the amount of either cold water or hot water running to your shower. When the shower goes cold and hot and then cold again its natural to blame the combi boiler for the problem.
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After a few seconds say 10-20 of decent hot water it turns completely cold for another 10-20 seconds even if I max out the control.
Hot water keeps going cold in shower. Either take the shower head off and soak it in vinegar water for 12 hour to clean it or tap out the water restrictor screen in the center of it and see if that solves the problem. To explain this in detail we need to delve a little into combi boiler theory first. Some people may notice that their hot water fluctuates when other appliances are running.
Remove the restrictor from the shower head. It could be caused by an over-enthusiastic thermostatic mixing valve. How to solve the problem.
This is one of the most common culprits of causing water temperature fluctuation. The shower in our house keeps going hot and cold. Unscrew the shower unit from the wall look inside the pipe end you will see a plastic gauze this is the restrictor that reduces water flow.
Takeaways The most common reason for the water in the shower going hot and cold is usually damage in the heat exchanger of the. Fixing a damaged heat exchanger will require you to disassemble the boiler unit and possibly to replace the part. For example when a toilet flushes it will pull cold water to fill up the tank.
It takes approx 1 min to heat up the 1 min of hot 1 min of cold 1 min of hot and keeps repeating. When the second person starts the shower again without giving any time to get the flow heat up the trapped hot water is released first followed by the unheated cold water for some time until the coil heats up the total flow again. So you get hot water and then cold and thne hot.
You see if not enough cold water is flowing over the heat exchanger it runs the risk of overheating. However if the flame is steady while someone else is showering and reports the water going hot and cold you may have a different problem. Your boiler is recommended to be at around 12-15bar when the system is COLD when the heating is ON and up to temperature this will rise up to around 2 bar because of the heated water expanding this is normal operation rises of more than around 05 bar when the heating is.
Very easy job my wife can do it. So this causes the safety device to turn off the power to your heat until the shower cools to a safe level resulting in cold water for you. Pull it out with long nose pliers or leaver it out with something and reconnect shower unit.
When you turn out other faucets at the same time that increases water flow out of the water heater and. If youre curious the logic is that theres not enough water entering your shower to cool it. The shower itself doesnt have a brand name but I think its a bath store model as the rest of the bathroom suit has that.
Your shower gets hotter for a moment while the toilet fills and the cold water is sent to the toilet but then that cold water becomes available again mixing with the hot water going to shower resulting in a drop in temperature. So to avoid damage to the heat exchanger and to avoid scalding you with super hot water your tankless unit will shut itself off leaving you with cold water in the middle of your shower. When one branch needs water such as someone flushing the toilet that branch suddenly siphons off some cold water.
The shower would get cold if somebody used hot water for something almost certainly not a toilet flush instead of cold. Its not advisable for an amateur to attempt any repair. Having an absolute nightmare.
Get the hot water in the pipes but back inside the water heater some cold water passes through before the unit ignites and starts heating up. The shower is run of the combi boiler Alpha CB28.
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