Remeha E44 Fault Code: Causes, Fixes & Repair Costs
What does the Remeha E44 fault code mean?
The E44 code tells you that the boiler's control system has run an internal check on its configuration settings and found something it doesn't like — either a value is missing, out of range, or has become corrupted. Remeha refers to these as 'parameter errors', and the two specific values most commonly at fault are labelled dF and dU, which are unique configuration figures printed on the data plate fixed underneath the boiler. Because the boiler cannot be sure it is set up correctly, it locks out as a precaution until the settings are verified and restored.
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
- Power cut or voltage spike corrupting stored settings Common
A sudden loss of mains power or an electrical surge can wipe or scramble the values held in the control board's non-volatile memory. When the boiler restarts and reads those settings, it detects the inconsistency and raises E44. This is the most frequently reported trigger, especially after storms or local power interruptions.
- Newly fitted or recently replaced PCB not yet configured Common
When a PCB is swapped out — whether during a previous repair or as a new installation — it arrives with factory defaults rather than the boiler-specific dF and dU values. Until an engineer programmes those figures in from the data plate, the board will flag E44 every time it checks its parameters.
- Gradual PCB wear or internal memory failure Sometimes
Over time, the memory components on the PCB can degrade and lose the ability to retain settings reliably. If the E44 code keeps returning even after the parameters have been re-entered correctly, this points to the board itself failing rather than a simple programming issue.
How to fix it
- Reset the boiler DIY safe
Locate the reset button on your Remeha boiler (usually a flame symbol with a line through it, or a dedicated reset button — check your manual if unsure). Press and hold for around three seconds, then wait for the boiler to restart. If E44 clears and the boiler fires up normally, monitor it over the next day or two to confirm the fault does not return. Do not reset more than two or three times in quick succession.
- Check the data plate for dF and dU values DIY safe
The boiler's unique configuration values (dF and dU) are printed on a data plate, typically attached to the underside or inner casing of the boiler. Note these numbers down carefully before calling an engineer — having them ready will save time and potentially reduce call-out costs.
- Have a Gas Safe engineer re-enter the dF and dU parameters Gas Safe engineer
If the reset does not clear E44, the dF and dU values need to be re-entered into the control board via the service menu. This requires navigating menus that are locked behind installer-level access and must only be carried out by a Gas Safe registered engineer. The engineer will enter the values from the data plate to restore the correct configuration.
- Engineer to assess the PCB if reprogramming fails Gas Safe engineer
If re-entering the correct parameter values does not resolve the fault, the PCB's internal memory may be damaged or failing. The engineer may need to contact Remeha's technical support line (Heateam) for guidance, and in most cases this will confirm that the PCB needs to be replaced. The engineer will source the correct board for your model and programme it with your boiler's dF and dU values.
- Call a Gas Safe registered engineer if you have not already done so Gas Safe engineer
If E44 persists after a reset, call a Gas Safe registered engineer. This fault almost always requires professional intervention — either to reprogram the control board or to replace it. Do not attempt to access the boiler's wiring, PCB, or service menus yourself.
Parts you may need
- Remeha PCB (control board) · from £220
- PCB memory/EEPROM component (if replaced independently) · 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 £90–£350, depending on the underlying cause.
Frequently asked questions
Can I fix Remeha E44 myself by resetting the boiler?
A reset is always worth trying first and is safe for a homeowner to do. If E44 clears after a reset and stays away, no further action is needed. However, if the fault comes back — or doesn't clear at all — you'll need a Gas Safe engineer to re-enter the dF and dU configuration values or assess the PCB. Do not reset the boiler more than two or three times in a row.
Where do I find the dF and dU values for my Remeha boiler?
These two figures are printed on a data plate that is usually fixed to the underside of the boiler casing. Some models have it on the inside of the front panel. Before calling an engineer, locate and note down both values — the engineer will need them to reprogram the control board, and having them ready can shorten the visit.
How much does it cost to fix Remeha E44 in the UK?
If the fix is simply re-entering the parameters, expect to pay roughly £90–£180 covering the engineer's call-out and labour. If the PCB needs replacing, the total cost including parts and labour typically rises to around £300–£500 for most Remeha models. Specialist or older boards can cost more — occasionally £600 or above — but this is the exception rather than the rule. If your boiler is over 10–12 years old and facing a PCB replacement, it is worth getting a new boiler quote at the same time.
Why does E44 appear after a power cut?
The boiler's control board stores its configuration settings — including the dF and dU values — in a small memory chip. A sudden power cut or voltage spike can corrupt the data held there. When power is restored and the board runs its start-up checks, it detects that the stored values are missing or invalid and locks out with E44. In most cases, an engineer can clear this quickly by re-entering the correct values from the data plate, and no parts are needed.
Is Remeha E44 related to E43?
Yes, E43 and E44 are closely related on Remeha boilers. E43 typically points to a fault during the parameter reading process itself, whereas E44 indicates that the parameters were read but found to contain inconsistencies. In practice, both codes are often resolved the same way — a reset followed by re-entry of the dF and dU values by a Gas Safe engineer — so if you see either code, the diagnostic approach is the same.