Worcester Bosch Greenstar i and Si Surrey

The Greenstar i range (25i to 40i) and Si range (25Si to 35Si) are older Worcester boilers that were widely installed across Surrey in the late 2000s and early 2010s. Still reliable when maintained, they can develop ignition and heat exchanger problems as they age. Call 0800 999 1609 for a same day diagnosis across Surrey.

Models in the i and Si Range

• Greenstar 25i, 28i, 30i, 35i, 40i — conventional combi boilers
• Greenstar 25Si, 28Si, 30Si, 35Si — system boilers for cylinder installations

Common i and Si Faults

• EA227 — Ignition failure. Electrode or gas valve most likely cause
• E9 — Overheat. Lime scale common in Surrey hard water areas
• 2970 — Fan or flue blockage

Surrey hard water accelerates lime scale in older Worcester heat exchangers. Descaling and inhibitor treatment can extend the life of an i or Si significantly. Call 0800 999 1609.