E1
Alpha E1, Low water pressure, system below 0.5 bar
MEDIUMRepressurise to 1.5 bar. Recurring E1 means a leak, book a trace, don't just keep topping up.
Same-day repairs on every Alpha model, E-Tec, Evoke, InTec and older CD ranges, by Gas Safe engineers who work on Alpha combis regularly across London. Common parts on the van, one-visit fixes wherever the diagnosis allows.
Average reply under 10 minutes. No obligation.
Call 020 3000 0000Alpha's E-Tec and Evoke ranges are popular with London landlords and letting agents thanks to their compact footprint and competitive pricing. The trade-off is that they're worked hard: we see plenty of E1 low-pressure lockouts (usually a slow leak on the system) and E10 flow sensor faults on units that have run through a few winters without a proper service. E110 and E133 lockouts on older Alphas typically mean sludge in the heat exchanger or ignition electrode wear.
Alpha parts availability has improved considerably in the last few years, and our engineers carry the common E-Tec and InTec spares, sensors, electrodes, diverter cartridges, on the van. That keeps our first-visit fix rate high on Alpha jobs.
Repressurise to 1.5 bar. Recurring E1 means a leak, book a trace, don't just keep topping up.
Usually a failed NTC sensor. A single-visit fix once diagnosed.
Similar to E10, a return NTC replacement. Engineer visit required.
Sludged heat exchanger or a failed thermistor. Don't keep resetting, book a proper diagnosis.
Check other gas appliances. If they work, the fault is internal, electrodes, gas valve or PCB.
Showing a different code? Call 020 3000 0000 and read it to us, we'll tell you what it means over the phone, free.
If your Alpha is over 12 years old and facing a major repair, we'll give you honest repair-vs-replace numbers on site, see our new boiler installation options.
Fixed quote before work begins, 12-month workmanship guarantee, genuine or manufacturer-approved parts.
"E1 pressure loss on a landlord flat. Traced a slow leak on the isolation valve, fixed properly, CP12 issued."
"E10 flow sensor fault. New NTC fitted from the van, boiler back on within 40 minutes."
"E133 ignition lockout. Full electrode kit replaced, gas valve cleaned, single-visit fix."
Alpha-trained Gas Safe engineers across all 32 London boroughs, 24/7.