BoilerFaultCodesWhat the manual says
Manufacturer manualProductinwaitingperiod/operationblockfunctionduetolowwaterpressure(flow/returnspreadtoolarge)
From this model's manual
Verified against the Glow Worm/Glow Worm Easicom3 System installation & service manual, page 42.
DIY fix possible
Check your boiler's pressure gauge on the front display; if it is below 1.0 bar, you likely need to top up the pressure.Locate the external filling loop (a silver flexi-hose under the boiler) and slowly open the valves to let water in until the needle reaches 1.2 to 1.5 bar.Close the valves tightly and restart the boiler.
Find a Gas Safe engineer
Search the official register →
Boiler cover options
Avoid the next call-out bill
A cover plan would handle faults like S.53: no call-out fees, no surprise bills.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.
Related fault codes
All 90 fault codes on the Easicom3 System
Seeing a different code? Every code this model can display, in one place.
F.00F.01F.10F.11F.13F.20F.22F.23F.24F.25F.27F.28F.29F.32F.49F.61F.62F.63F.64F.65F.67F.68F.70F.71F.72F.73F.74F.75F.77F.78F.83F.84F.85F.86F.87F.88F.89F.97F22P.01P.02P.03P.04P.05P.06P.07S.0S.01S.02S.03S.04S.05S.06S.07S.08S.10S.11S.13S.14S.15S.16S.17S.20S.21S.22S.23S.24S.25S.26S.27S.28S.30S.31S.32S.33S.34S.39S.41S.42S.46S.54S.88S.91S.96S.97S.98S.99S.108S.109