Alpha boiler fault codes
Alpha publish their full error table in the installation and servicing instructions on their own website, which is more than several larger manufacturers manage, and the set runs from E01 to E76 rather than stopping in the sixties. Two features of it are worth learning before you look up a number. Alpha separate a pump that has stopped from a pump that is full of air — E60 is "pump fault", E61 is "air in the pump" — where most manufacturers give you one code for both, and that split is genuinely diagnostic, because a seized pump is a part to buy and air in the pump is a condition to remove. And E37, which Alpha define as insufficient supply voltage to operate the boiler, is a boiler code that is not about the boiler at all. The set also escalates in one place worth knowing about: E45 is the appliance quietly reducing burner output because the flue has reached 110°C, and Alpha say plainly that if the temperature keeps rising it will lock out and show E03. So an E45 nobody acted on becomes an E03, and they are one story rather than two faults.
Where the code shows on a Alpha
The code appears on the small backlit LCD as E followed by two digits, alongside a padlock symbol Alpha label "boiler locked - reset required". The genuinely useful thing on these appliances is not on the front at all: hold the INFO button for a second and scroll to d9, and the appliance lists its last five faults. That turns "it did something odd on Tuesday and it is fine now" into a readable history, and d10 clears it once the work is done. Anyone booking an engineer can read d9 out over the phone.
How to reset a Alpha
Press the reset button. Do not hold it — on these appliances holding it for eight seconds with no demand present starts chimney sweep mode, which makes the boiler fire at a fixed output for commissioning and is not what anybody wants from a lockout. Alpha's own instruction is a plain press, and their escalation is unusually short: if the fault still occurs after pressing reset, contact an approved engineer or Alpha's service support department. The appliance counts attempts too. Five produces E08, "maximum number of resets reached", and Alpha clear that one by turning the boiler off and on rather than by pressing anything. Where the guarantee is still live, Alpha's Technical Helpline is the route their manuals point at.
Most common Alpha faults
The Alpha codes people look up most.
- E01Get it checkedThe appliance tried to light and could not confirm a flame, so it has locked out. In winter a frozen condensate pipe is the most likely reason.
- E10Get it checkedAlpha describe E10 as the primary pressure switch operating. Refilling to their green band usually clears it, but the switch itself is on their own list of causes.
- E02Get it checkedThe overheat thermostat has tripped. Almost always this means water is not moving through the appliance properly rather than that it is running too hot.
- E16Get it checkedThe control board cannot confirm the fan is running at the speed it asked for, so it will not let the burner light. This one needs an engineer.
Every Alpha fault code
8 published codes. Filtering happens in the page — every one is in the HTML.
Showing 8 of 8 codes
Alpha models
Codes can differ between generations. Check yours.
Guides that help with Alpha faults
Boiler fault codes explained: what they actually tell you
Codes look like diagnoses and are not. Understanding which family a code belongs to turns a meaningless number into a genuinely useful starting point.Read the guideHow to repressurise a boiler
The five-minute job that resolves more no-heating calls than any other. Here is how to do it properly, and how to tell when topping up is the wrong answer.Read the guideWhat a Gas Safe engineer actually checks in a boiler service
Most people pay for this once a year and stand in another room while it happens. Here is what should be going on, which test cannot be faked, and how to tell a real service from twenty minutes and an invoice.Read the guideWhat to do when your condensate pipe freezes
The single most common winter boiler fault, and one of the few you can genuinely fix yourself in fifteen minutes with a kettle and some patience.Read the guide
Looking for Alpha’s own support? www.alpha-innovation.co.uk. We are not affiliated with Alpha.