My mom has a Biasi M90B 24S, (construction year 2009), previously she had several problems with this combi boiler, every now and then it needed a HE cleaning, sometimes CH wasn't operating, other times HW. Lately she experienced the following:
- How water through the taps came in waves: hot for 15 seconds, cold for 20 seconds...
I checked the pressure, the machine was showing a bit less than 1.4 bar. I closed all the lines, took the power cable out, and drained the boiler. The water which came out was quite dirty, gray-ish coloured. I wanted to disassemble the HE and clean it, but looked a bit complicated to do, so I just refilled the system with freshwater, to roughly 1.8-1.9 bar and replaced the covers, reconnected the cable.
Now there is no HW - if I open the taps, the shaft / pin which moves and activates the switch goes out and pushes the switch for 2 seconds, then returns, stays there, and there is no ignition, no heating. I noticed that there is a red LED light inside, which turns on. On the front panel, out of the 3 LEDs the first one is blinking green.
If I turn on the thermostat, CH is working, there is ignition, boiler is working, shaft stays out, switch is activated continously.
I took off the switch (which is operated by that shaft), and while the tap for hot water was on, and I pushed the switch with a match, there was also ignition, boiler started to heat up.
Where should I start now? What have I done wrong, that there is not anymore HW? Is there a way to reset, or should I check the diaphragm? I will upload a picture, please help me with some information according to the picture, if need to check diaphragm...
Thank you for your help in advance!
- How water through the taps came in waves: hot for 15 seconds, cold for 20 seconds...
I checked the pressure, the machine was showing a bit less than 1.4 bar. I closed all the lines, took the power cable out, and drained the boiler. The water which came out was quite dirty, gray-ish coloured. I wanted to disassemble the HE and clean it, but looked a bit complicated to do, so I just refilled the system with freshwater, to roughly 1.8-1.9 bar and replaced the covers, reconnected the cable.
Now there is no HW - if I open the taps, the shaft / pin which moves and activates the switch goes out and pushes the switch for 2 seconds, then returns, stays there, and there is no ignition, no heating. I noticed that there is a red LED light inside, which turns on. On the front panel, out of the 3 LEDs the first one is blinking green.
If I turn on the thermostat, CH is working, there is ignition, boiler is working, shaft stays out, switch is activated continously.
I took off the switch (which is operated by that shaft), and while the tap for hot water was on, and I pushed the switch with a match, there was also ignition, boiler started to heat up.
Where should I start now? What have I done wrong, that there is not anymore HW? Is there a way to reset, or should I check the diaphragm? I will upload a picture, please help me with some information according to the picture, if need to check diaphragm...
Thank you for your help in advance!
