![]() I don't think I can do anything more without having to disturb the gas side which I know is illegal. I have swapped the pumps over between the two boilers in case the pump was faulty, but the problem has remained. I removed the directional control valve (which isn't used because of the low loss header) and found it was completely caked in a hard shiny black deposit which took a lot of effort to break up and remove from the rubber. I have flushed through the heat exchanger with water from a garden hose and got a small amount of magnetite out, but it seemed to be flowing freely. ![]() His next suggestion was to start replacing parts until he figures out what the problem is, but given the cost of Viessmann parts, I wasn't keen on that idea, so I have tried to go as far as I can myself without touching any of the gas related parts. When they were recently serviced the plumber replaced the flame sensors and the spark ignition probes on both boilers, but that didn't solve the problem. One still works fine, but one keeps overheating with either an F2 or an F3 error. They were installed as part of a whole house re-plumb and have had Fernox MB-1 Heating Protector in the circuit since day one. They are about 7 years old and have run perfectly since they were first installed until now. I have two Vitodens 200-W system boilers connected via a low loss header.
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