Boiler Repair in Crawley, Horsham and Surrey

Pressure that drops repeatedly means water is escaping somewhere. The three usual causes are a leak on the system pipework or a radiator valve, a failed expansion vessel inside the boiler, or a passing pressure relief valve discharging outside. Topping it up is a temporary measure, not a fix. We trace the actual cause.

The honest rule of thumb is that if the boiler is over 12 to 15 years old, the repair is a significant fraction of a new install, and parts are getting hard to source, replacement usually makes better financial sense. Under that, repair almost always wins. We will give you both numbers rather than steering you toward the bigger job.

Codes are manufacturer specific. As common examples, a Vaillant F.75 points to a pump or pressure sensor fault, a Worcester EA is a flame detection failure often caused by ignition or gas supply, and a Vaillant F.28 is a failed ignition. The code narrows the search but it is not a diagnosis on its own. We test the actual component rather than replacing parts based on the code.

We work on all the major brands including Worcester Bosch, Vaillant, Ideal, Baxi, Glow-worm, Potterton and Viessmann. We also work on older conventional boilers that a lot of firms will not touch, including back boilers and floor-standing units.

Banging or kettling is usually limescale and magnetite sludge on the heat exchanger causing water to boil locally and flash to steam. It is not immediately dangerous, but it is doing real damage. The thermal stress can crack the heat exchanger, which turns a cleanable problem into a new boiler. Get it looked at rather than living with it.