Alpha boiler showing E43 in Coventry? What we know about this code on Alpha combis like the Eco2 Plus, the safe checks to try, and what a recent Coventry repair turned out to be.
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Alpha boilers are less common than Worcester or Vaillant, so their codes are harder to look up. E43 is one of those. Alpha does not publish one simple meaning for it across the Eco2 Plus range, and the wording can differ between models. Your manual, usually kept inside the boiler door, is the place to check first.
What we can share is real. A Coventry household rang us with an Alpha Eco2 Plus combi showing E43. There was no heating and no hot water. The engineer traced it to the gas valve, fitted a new one, and the boiler was back in action. That will not be the cause every time, but it shows the code is worth taking seriously rather than resetting over and over.
Plenty of Alphas were fitted in Coventry in the 2010s, often in new-build estates and in rented homes around Canley and Stoke. Many are now past their first ten years, which is when parts like valves and sensors start to tire.
Check whether the hob lights. If nothing gas-powered works, the supply is the problem, not the boiler. On a prepayment meter, check there is credit.
Look at the gauge on the front of the boiler. If it has fallen well below the level on the label, top up with the filling loop as your manual describes.
In a frost, the white plastic pipe running outside can freeze. Pour warm water, never boiling, along it, then reset once.
Reset once. If E43 comes straight back, leave the boiler off. Repeated attempts will not fix a failed part.
The gas supply and pressure at the valve, the gas valve itself, the ignition and the sensors. The fault history on the boiler helps narrow it down.
Send a picture of the E43 on the display and the label inside the door. Tell us whether you have heating, hot water, or neither. That alone narrows it a lot.
It varies by model, so check the manual for yours. On the Coventry Eco2 Plus we repaired, it came with no heat or hot water and the gas valve had failed.
The boiler has stopped itself, which is the safe thing to do. Smell gas? Leave the house, do not use switches, and call the National Gas Emergency line on 0800 111 999. A fault code is never a gas leak, but a smell always is.
Yes. Parts for the Eco2 Plus and similar models are still available, and most repairs are done on one or two visits.
Ask for their Gas Safe ID card. The back lists the work they are qualified to do.
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