Remeha E.02.13 Fault Code: Causes, Fixes & Repair Costs
What does the Remeha E.02.13 fault code mean?
The E.02.13 code appears on Remeha boilers — most notably the Tzerra Ace and Quinta Ace — and indicates that the boiler's control unit has received a blocking signal from an external source, or that an installer parameter is set outside its permitted range. The 'E' prefix means this is a locking fault: the boiler will not restart on its own and requires the underlying cause to be resolved before a manual reset will clear it. In practice, this usually means something wired into the boiler's external enable/disable or safety-input terminals has tripped, or a configuration setting in the control automaton has drifted out of bounds. Because the trigger is frequently external rather than internal, this fault can sometimes be resolved without replacing any boiler components.
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
- External blocking device has tripped Common
A frost thermostat, remote lockout switch, low-pressure safety switch, or zone-control device wired to the boiler's external input terminals has activated and sent a blocking signal to the control unit. This is the single most common cause and is worth checking before anything else.
- Incorrectly configured installer parameter Common
One or more parameters stored in the boiler's control unit has been set outside its permitted range — either during commissioning, after a firmware update, or following accidental adjustment. The control automaton treats this as a blocking condition and prevents normal operation until the value is corrected by an engineer.
- Wiring fault on external input terminals Sometimes
A loose connection, damaged cable, or short circuit on the wires feeding the boiler's external control terminals can produce a false blocking signal. This is indistinguishable from a genuine trip until the terminals are inspected with appropriate test equipment.
- BMS or building controls interlock Sometimes
In commercial or larger residential installations, a Building Management System or third-party heating controller wired into the boiler may be commanding a shutdown due to its own internal fault or a scheduling conflict.
- Control PCB fault Rare
In rare cases the PCB itself misinterprets or generates a spurious blocking signal. This is only likely if all external wiring and parameters have been ruled out.
How to fix it
- Check your gas supply and system pressure DIY safe
Make sure the gas supply to your home is on and other gas appliances are working normally. Check the pressure gauge on the boiler — it should typically read between 1.0 and 1.5 bar when cold. If it is below 1.0 bar, top it up via the filling loop until it sits around 1.2–1.5 bar, then attempt a reset.
- Reset the boiler (up to twice) DIY safe
Press and hold the reset button on the boiler's control panel as described in your user guide. Wait for the boiler to attempt a restart. Because E.02.13 is a locking fault, a reset alone will not resolve it unless the external trigger has already cleared — but it is worth trying once or twice to establish whether the fault is intermittent.
- Inspect external devices wired to the boiler DIY safe
Look for any frost thermostats, external on/off switches, or remote alarm devices connected to the boiler's external terminals. Check whether any of these has physically tripped or been turned off. A frost stat that has activated due to cold weather, for example, can often simply be reset at the device itself. Do not touch internal boiler wiring — this step is limited to the external device itself.
- Note down any visible wiring condition at the external terminals DIY safe
Without removing covers or touching live wiring, visually inspect the cable runs going into the boiler from external controls. If you can see obvious physical damage such as a kinked, pinched, or burned cable, note this and pass the information to the engineer — do not attempt to repair it yourself.
- Contact a Gas Safe registered engineer to diagnose and resolve the fault Gas Safe engineer
A Gas Safe engineer familiar with Remeha systems can connect to the boiler's diagnostic menu to read the full fault history, measure voltage and continuity on the external input terminals, review and correct any out-of-range installer parameters, and confirm normal operation after the reset. This step is mandatory if the fault persists after the checks above.
Parts you may need
- Remeha PCB / control unit · from £280
- External frost thermostat (replacement) · from £35
- Low water pressure switch · from £45
- External wiring loom / control cable · from £25
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 £100–£300, depending on the underlying cause.
Frequently asked questions
Can I fix Remeha E.02.13 myself?
Partly. You can safely check that the gas supply is on, top up the system pressure if it is low, inspect any external devices such as a frost thermostat to see if they have tripped, and attempt a boiler reset. However, because this is a locking fault that often involves the boiler's external wiring terminals or internal parameter settings, the underlying fix almost always requires a Gas Safe registered engineer.
Why won't my Remeha boiler reset after showing E.02.13?
The 'E' prefix on Remeha fault codes means the boiler has entered a permanent lockout rather than an auto-reset blocking state. It will not restart until the root cause — the active blocking signal or out-of-range parameter — has been properly addressed. Simply pressing reset repeatedly will not help; the external trigger or configuration issue must be resolved first.
How much does it cost to fix a Remeha E.02.13 fault?
If the cause is an external device such as a frost thermostat that just needs resetting, or an installer parameter that needs adjusting, most engineers will resolve it for £100–£200 including the call-out. If wiring repairs are needed the cost typically rises to £150–£300. A PCB replacement, which is only needed in rare cases where the control unit itself is faulty, can add a further £250–£350 on top of labour, so it is worth exhausting the simpler causes first.
Which Remeha boilers show the E.02.13 code?
E.02.13 uses Remeha's newer multi-part alphanumeric fault code format, which is used on the Tzerra Ace and Quinta Ace ranges. Older models such as the Avanta Plus use a different code format, so if you have an older Remeha boiler displaying a similar message, the code numbering may differ slightly. If in doubt, check the model name on the front of the boiler before searching for fault information.