Remeha E.04.17 Fault Code: Causes, Fixes & Repair Costs
What does the Remeha E.04.17 fault code mean?
The E.04.17 fault code on a Remeha boiler indicates that the internal electronic driver responsible for controlling the gas valve has failed or is not functioning correctly. In practical terms, the boiler's control system cannot send a reliable signal to open or close the gas valve, so the burner cannot operate safely. As a result, the boiler locks itself out immediately to prevent any gas-related hazard. This code falls within the E.04 group, which covers gas valve control and ignition electronics, and is most commonly seen on Remeha Quinta Ace and other Ace-generation models.
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 PCB (printed circuit board) Common
The boiler's control PCB is responsible for sending the correct drive signal to the gas valve. If the PCB develops a fault — whether through component failure, moisture ingress, or age — it may fail to transmit that signal correctly, triggering E.04.17 even when the gas valve itself is perfectly serviceable. This is the single most common root cause of this code.
- Wiring fault or poor electrical connection to the gas valve Common
Loose terminals, corroded connectors, or damaged cable insulation in the harness running from the PCB to the gas valve can interrupt the control signal. Vibration over time, rodent damage, or a previous repair carried out poorly can all cause this type of wiring issue.
- Failed gas valve Sometimes
The gas valve itself contains internal solenoids and electronic components. If these fail, the valve may not respond to commands from the PCB, causing the boiler to detect a driver fault and lock out. The valve may show no obvious external damage, so electrical testing by an engineer is necessary to confirm this as the cause.
- Intermittent PCB signal fault Sometimes
In some cases the PCB is not completely failed but is producing an unstable or out-of-range drive signal — for example due to a degraded capacitor or solder joint. The boiler may reset and run briefly before the code returns. This is harder to diagnose and may require the PCB to be bench-tested or swapped.
How to fix it
- Note the exact fault code displayed and attempt a single boiler reset DIY safe
Before calling an engineer, write down the fault code (E.04.17) and the time it appeared. Press the reset button on the boiler once, following your model's instructions. If the boiler fires up and runs normally, monitor it closely over the next hour. If the fault returns — even once — do not reset again and proceed to call an engineer. Repeated resets on an electronic fault like this will not clear the underlying problem.
- Check that the gas supply to the property is working DIY safe
Confirm that other gas appliances in your home (hob, gas fire) are working normally. If nothing gas-powered is functioning, contact your gas supplier or call the National Gas Emergency Line on 0800 111 999. If the supply is fine but the boiler still faults, the problem is internal to the boiler.
- Inspect visible wiring and connectors around the boiler (do not open the boiler casing) DIY safe
With the boiler switched off at the isolator, look at any external wiring connections you can see without removing the boiler casing. Check that no obvious cables have come loose from external terminals. Do not remove the boiler cover or touch any internal components — this must be done by a Gas Safe engineer.
- Gas Safe engineer to inspect internal wiring and gas valve connections Gas Safe engineer
The engineer should remove the boiler casing and carry out a full visual inspection of the wiring loom from the PCB to the gas valve. They will check connector terminals for corrosion, check the integrity of the cable insulation, and reseat any connections that appear loose. This step alone can resolve the fault if a poor connection is found.
- Gas Safe engineer to test the gas valve electrically Gas Safe engineer
Using appropriate test equipment, the engineer will measure the drive voltage and resistance across the gas valve solenoids to determine whether the valve is receiving the correct signal from the PCB and whether it is responding. If the valve is receiving a good signal but not functioning, the valve itself needs replacing. If no signal is reaching the valve, the PCB is the likely culprit.
- Gas Safe engineer to replace the gas valve if it is confirmed faulty Gas Safe engineer
If electrical testing confirms the gas valve has failed internally, the engineer will fit a manufacturer-approved replacement. As this involves work on the gas circuit, it must only be carried out by a Gas Safe registered engineer. The gas supply must be isolated, the new valve fitted and tested for leaks, and the boiler run through a full commissioning cycle before sign-off.
- Gas Safe engineer to replace the PCB if the drive signal is absent or incorrect Gas Safe engineer
If the gas valve tests as serviceable but no correct drive signal is reaching it from the PCB, the control board will need to be replaced. PCB replacement on Remeha Ace-series boilers involves sourcing the correct board for the model variant, careful installation, and re-commissioning the boiler. The engineer should clear the fault log and confirm the boiler runs through a full heat and hot water cycle without the code returning.
- Call a Gas Safe registered engineer if you have not already done so Gas Safe engineer
E.04.17 is an internal electronic fault with no safe homeowner repair route beyond the reset described above. Contact a Gas Safe registered engineer and quote the fault code. You can verify an engineer's registration at gassaferegister.co.uk before booking.
Parts you may need
- Remeha Quinta Ace PCB / control board · from £280
- Gas valve assembly (Remeha Ace series) · from £130
- Gas valve wiring harness · from £35
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 £200–£500, depending on the underlying cause.
Frequently asked questions
Can I fix Remeha E.04.17 myself?
No. Beyond attempting a single reset and checking your gas supply is on, there is nothing a homeowner can safely do to resolve this fault. It involves the gas valve control circuit and potentially the PCB — both of which must only be worked on by a Gas Safe registered engineer. Attempting to open the boiler casing and interfere with gas components is illegal for unregistered individuals and potentially dangerous.
How much does it cost to fix E.04.17 in the UK?
Most people with this fault pay somewhere between £200 and £500 including parts, labour, and the initial diagnostic visit. A gas valve replacement with labour typically falls in the £180–£300 range, while a PCB replacement usually costs £350–£500 including parts. If both components need attention, or if your boiler is out of warranty and parts need sourcing specially, costs can push higher. Diagnostic or call-out fees of £60–£100 are often charged separately before any repair work is quoted.
My Remeha boiler is 10 years old — is it worth replacing the PCB?
It is worth thinking carefully before spending £350–£500 on a PCB for a boiler that is approaching the end of its typical 10–15 year lifespan. A new boiler installation costs roughly £2,000–£3,500 for a comparable Remeha model, but it comes with a manufacturer warranty, improved efficiency, and no near-term repair risk. Ask your engineer for an honest assessment of the boiler's overall condition before committing to major component replacement on an older appliance.
What if I can smell gas when the E.04.17 code is showing?
Do not touch any switches or electrical items, do not use your phone inside the property, open windows and doors, leave the building immediately, and call the National Gas Emergency Line on 0800 111 999 from outside. The E.04.17 fault locks the boiler out precisely to prevent uncontrolled gas flow, but if you can smell gas there may be a separate leak elsewhere in the system that needs urgent attention.