Alpha InTec Fault Codes
The Alpha InTec was the brand's mainstream range before and alongside the E-Tec — InTec combi and system boilers in several outputs, including the InTec GS/XS variants — and large numbers remain at work. It uses Alpha's E-code scheme on a digital display: ignition and flame-supervision faults in the low numbers, E10 for low pressure, sensor and circulation codes beyond. InTecs now span the awkward middle years of a boiler's life — old enough for wear faults, young enough to be worth fixing properly. The Immergas-derived platform is well understood and parts are readily available. The codes below are the ones InTec owners actually search for, each linking to the full cause-and-fix page.
Where InTec fault codes appear
The InTec shows E-prefixed codes on its front display when faults trip, replacing the temperature reading. If the boiler is cycling — attempting, failing, retrying — watch a full attempt and note the code at the failure moment.
Resetting a Alpha InTec
Press the reset button briefly to clear the lockout and retry. E10 wants a top-up to 1–1.5 bar at the filling loop first. A code that returns after a single reset has earned a Gas Safe engineer's visit; on a mid-life boiler, prompt small repairs are exactly what postpones the big ones.
Common InTec problems
InTecs most often log E10 pressure loss, ignition lockouts (electrode and condensate causes in the usual seasonal pattern), and — with age — circulation and sensor codes as pumps and thermistors wear. Water treatment tells: an InTec on a filtered, inhibited system reads years younger than its twin on sludge.
Most common InTec fault codes
- E10 The E10 fault code on Alpha boilers is triggered when the boiler detects that system… Read more →
- E1 Alpha boilers display two closely related fault codes that are often confused: E1 and… Read more →
- E2 The E2 fault code on an Alpha boiler means the boiler has tried to light the burner but… Read more →
- E5 The E5 code on an Alpha boiler signals that the primary flow NTC thermistor — the sensor… Read more →
- E25 The E25 fault code on Alpha boilers is a protective shutdown triggered when the boiler… Read more →