Remeha E2 Fault Code: Causes, Fixes & Repair Costs
What does the Remeha E2 fault code mean?
The E2 code appears on Remeha boilers — most commonly the Avanta range — when the boiler detects that the return water temperature is higher than the flow (output) temperature. Under normal operation, water leaves the boiler hot, travels around your radiators or underfloor circuit losing heat, and returns cooler. When the return is warmer than the flow, something has disrupted that circulation pattern, and the boiler locks out as a safety measure. The fault is displayed alternately as 'e' and '2' on the boiler's display. Note: on newer Remeha models such as the Quinta Ace, fault codes follow a different alphanumeric format (e.g. E.02.XX) — always cross-reference with your specific model's manual.
General guidance only — not a substitute for professional advice, and not certified by a Gas Safe engineer. Always have your specific appliance assessed by a qualified professional. Any gas work must be carried out by a Gas Safe registered engineer. If you smell gas or suspect carbon monoxide, leave the property and call the National Gas Emergency line on 0800 111 999.
Common causes
- Faulty or seized circulation pump Common
The pump is responsible for pushing water around your heating system. If it seizes or fails completely, hot water sits at the flow sensor rather than circulating, causing the return sensor to read an abnormally high temperature relative to the flow. This is one of the most frequent causes of E2 on the Avanta range.
- Low system pressure or insufficient water Common
If the system pressure has dropped below around 1 bar, there may not be enough water in the circuit for the pump to move effectively. Poor flow leads to heat building up unevenly across the sensors, triggering the E2 lockout.
- Airlock in the heating circuit Sometimes
Trapped air pockets in the pipework or radiators can block the normal flow of water. This causes localised hot or cool spots that confuse the temperature sensors and can produce a false E2 reading.
- Faulty flow or return NTC temperature sensor Sometimes
If one of the NTC thermistor sensors is reading inaccurately — due to a poor connection, damage, or component failure — the boiler's control board may calculate an impossible temperature relationship between flow and return and trigger the lockout even when circulation is working correctly.
How to fix it
- Note the fault code and attempt a boiler reset DIY safe
Before doing anything else, take a photo or note of the E2 code on your display. Press and hold the reset button for approximately 3 seconds. If the boiler fires up and runs normally, monitor it over the next few hours. If the E2 code returns promptly, move on to the next steps rather than repeatedly resetting.
- Check the system pressure gauge DIY safe
Look at the pressure gauge on the boiler front — it should read between 1 and 1.5 bar when the system is cold. If it reads below 1 bar, the system needs repressurising. Locate the filling loop (a braided or plastic connector usually beneath the boiler), slowly open both valves until the gauge reaches around 1.2 bar, then close both valves firmly. Press reset afterwards. If you are unsure how to find or use the filling loop, check your boiler's user manual or contact an engineer.
- Bleed your radiators to remove trapped air DIY safe
Turn the heating on and let it warm up, then switch it off and let it cool slightly before bleeding. Using a radiator bleed key, open each radiator's bleed valve (usually top-right corner) until water, rather than air, trickles out. Re-check the system pressure after bleeding as it can drop, and top up again if needed. Some Remeha Avanta boilers have an automatic venting programme — consult your manual to see if yours does.
- Listen and feel for circulation pump operation DIY safe
With the boiler running (or attempting to run), place your hand gently on the pump body — on the Avanta it is typically located inside the casing. A working pump produces a faint hum and slight vibration. Complete silence and no vibration suggest the pump may have seized. Do not attempt to dismantle or rewire the pump yourself.
- Call a Gas Safe registered engineer to inspect and repair Gas Safe engineer
If the E2 code persists after repressurising, bleeding the radiators, and resetting, a Gas Safe engineer will need to investigate further. They can test the pump electrically, free a seized impeller or replace the pump if it has failed, check the NTC sensor resistances with a multimeter, and verify all wiring connections. Do not attempt any work involving the pump wiring, sensor replacement, or internal components yourself.
Parts you may need
- Circulation pump (suitable for Remeha Avanta) · from £80
- Flow NTC temperature sensor · from £25
- Return NTC temperature sensor · from £25
- Automatic air vent · from £12
The exact spare depends on your boiler's GC number (on the data badge). Check this against the part before buying.
Typical repair cost
Expect to pay roughly £120–£350, depending on the underlying cause.
Frequently asked questions
Can I fix the Remeha E2 fault myself?
Partly. Homeowners can safely top up the system pressure using the filling loop, bleed the radiators, and reset the boiler — and in some cases that is all that is needed. However, if those steps do not clear the fault, the likely culprits are a failed circulation pump or a faulty NTC sensor, both of which require a Gas Safe registered engineer to diagnose and replace.
How much does it cost to fix a Remeha E2 fault in the UK?
Most people with this fault pay somewhere between £120 and £350 once you factor in the engineer's call-out, diagnosis, and any parts. A simple repressurise or bleed done by an engineer might cost £80–£150. Replacing a circulation pump typically runs £200–£350 including labour and VAT. Sensor replacement is generally cheaper at around £100–£200. In rare cases where a PCB fault is mimicking the E2 code, costs can be higher — an engineer can confirm this on-site.
Why does my Remeha Avanta keep showing E2 after I reset it?
A fault that clears on reset but keeps returning usually means an underlying problem has not been resolved. The most common repeat offenders are a pump that is intermittently seizing, a slow pressure leak causing the system to gradually lose water, or a sensor that is giving borderline readings. Each reset is only masking the symptom — a Gas Safe engineer should carry out a proper diagnosis to find the root cause.
Is the E2 code the same on all Remeha boilers?
Not exactly. The E2 code is well documented for the Remeha Avanta range and refers specifically to the return temperature exceeding the flow temperature. On newer Remeha models such as the Quinta Ace, the fault coding system is different and uses a longer alphanumeric format (for example E.02.XX). If you have a model other than the Avanta, check your boiler's manual to confirm what E2 means on your specific unit before taking any action.