BoilerFaultCodesWhat the manual says
Manufacturer manualWater pressure sensor signal in the wrong range (too low)
From this model's manual
Verified against the Glow Worm/Glow Worm Compact installation & service manual, page 47.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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 F.73: 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 94 fault codes on the Compact
Seeing a different code? Every code this model can display, in one place.
d.00d.01d.02d.05d.06d.09d.10d.11d.14d.20d.21d.22d.36d.40d.43d.47d.50d.51d.60d.61d.64d.68d.69d.71d.80d.81d.82d.83d.85d.88d.90d.91d.94d.96d.149d.191d.192F.00F.01F.10F.13F.20F.22F.23F.24F.25F.27F.28F.29F.32F.33F.46F.49F.61F.62F.63F.64F.65F.67F.68F.70F.71F.72F.74F.75F.76F.77F.78F.83F.84F.85F.86F.87F.88F.89F.97P.00P.01P.03P.04P.08S.04S.06S.07S.11S.16S.17S.20S.46S.58S.76S.88S.96