boiler will shut off, and the low water shutoff light will come on. so, not sure what is the problem? because after breathing the water system from air, the boiler will work just fine, but after 2days later, same problem will occur again, and I will have to go thru the same process by breathing the system in order for it to work. this happened more than 5 times in last 2 weeks, pls help.I have 2 zones, I'm using programable thermostat in one side, and regular one on the other side.
if you have a pressurised system, and after bleeding the radiators you have to re-pressurize, you have air ingress. this could come from a small water leak somewhere in the boiler or pipework. if your system is filled via a header tank and the pump is away from the boiler, turn the pump speed down to reduce surging. hope this helps.
