This Ravenheat CSI 120 has been suffering with hot water problems. Hot water from the tap was fluctuating between hot and lukewarm. The reason for that was a blocked secondary heat exchanger. I have cleaned this exchanger about 3 months ago and suggested to the client that the system should be flushed to avoid the […]

Not all boilers are economical to repair and this one is a very good example. Vaillant Thermocompact with cracked main heat exchanger. When I got to the property the boiler main sealed chamber was full of water. Main burner was under water, gas valve full of water and on top of that all electronics (Main […]

If your Vaillant boiler is showing error code F.28 in very cold weather it is most likely that your condensation pipe is frozen outside. Pour hot water over the pipe and reset the boiler (Or turn it off and on at the spur switch). If possible put some pipe insulation on condensate pipework. Condensate pipework […]

Ariston Microgenus 24HE MFFI combination boiler breakdown. Symptoms were as follows: – boilers starts and temperature goes to about 40 degrees on DHW. After about 10-15 seconds burner goes out while pump and fan keep running.  Boiler displays error code E33 or E34. Water gets luke warm from the tap. Boiler does not go to […]

I was called to a boiler problem the other day. Boiler in question – 5 years old Worcester Bosch Greenstar 30si. Client was complaining that boiler would only fire up at full rate. Other symptoms included: explosive ignition, noisy combustion and going to lock out if boiler tried to modulate down. Faulty part below.   […]