We have an Ideal icos HE18 boiler and it’s developed a problem where every time the boiler starts up (either hot water or heating) the boiler makes loud banging noises. However, once the boiler has got going properly (which isn’t a given, see below) then it works fine without any issues.
Detailed explanation of what happens:
Once you turn the boiler on at the programmer (either on schedule or on demand) the boiler starts to fire up. The display will change from “0” to “c” and the led will start flashing as normal and then the led will turn solid. Then after about 30 seconds a banging and klunking noise can be heard from the boiler. This issue happens for both the hot water or central heating.
This banging noise (which is quite loud) will last for 15-30 seconds at which point the boiler realises something is wrong and the led starts flashing again and the banging noise stops.
Then either one of these 2 things happens after a minute or 2 has passed:
However, once the boiler is on and past the loud banging noise with the HW/CH working then it appears to work as normal until the programmer switches it off or the water is hot.
This morning it took 3 attempts at the programmer to get the hot water working.
Any ideas as to what is causing this and how to fix?
Detailed explanation of what happens:
Once you turn the boiler on at the programmer (either on schedule or on demand) the boiler starts to fire up. The display will change from “0” to “c” and the led will start flashing as normal and then the led will turn solid. Then after about 30 seconds a banging and klunking noise can be heard from the boiler. This issue happens for both the hot water or central heating.
This banging noise (which is quite loud) will last for 15-30 seconds at which point the boiler realises something is wrong and the led starts flashing again and the banging noise stops.
Then either one of these 2 things happens after a minute or 2 has passed:
1. It will start working as normal for hot water or suppling to the radiators without an issue; or
2. The boiler enters into a repetitive cycle of trying to start up, making a loud banging noise for 15-30 seconds, stopping for 1-2 minutes. But no HW or CH is supplied. And this just keeps on repeating itself. The only way to get out of this cycle is to turn off the HW/CH at the programmer, wait 5-10 minutes and try again from the start.
However, once the boiler is on and past the loud banging noise with the HW/CH working then it appears to work as normal until the programmer switches it off or the water is hot.
This morning it took 3 attempts at the programmer to get the hot water working.
Any ideas as to what is causing this and how to fix?