Servicing a Remeha boiler and reading its messages

Which Remeha boilers I work on

Remeha’s wall-hung boilers come in three families, and its knowledge base explains the difference. The Avanta Ace is the basic model, with a manually adjusted gas valve. The Tzerra Ace-Matic sits in the middle. The Calenta Ace-Matic is the advanced one, up to 40 kW, with automatic gas control, a text display instead of a code display, and a single spiral heat exchanger that Remeha says is less sensitive to fouling. The older Avanta, Avanta Plus, Tzerra and Calenta are the previous generations, and the Quinta is the larger boiler.

Whichever you have, Remeha publishes a maintenance checklist per model, and the type plate tells me which one applies. Send me a photo of it with your message.

How often Remeha says to service it

Remeha’s answer is in its knowledge base: the installation manual for your model says how often, and that is usually once a year.

Most Remeha boilers tell you. When the boiler has counted its way to a service, a notification appears on the display, and the Avanta Ace user manual says it must be followed up within two months. The exceptions are the Avanta and Avanta Plus, which Remeha says show no service notification at all, so on those you keep your own diary.

Don’t clear the message yourself. Remeha’s page on the service notification says only the installer may reset it, after the service has been done. I reset it as the last step of the visit.

Pressure and the dirt filter

Remeha recommends topping up to between 1.5 and 2 bar when the radiators don’t heat fully and the gauge reads under 1.5 bar. The Avanta Ace manual puts the trigger at 0.8 bar, and the Ace models have a pressure switch that stops the boiler starting when the pressure is too low. If the pressure drops regularly, Remeha says to contact an installer. My pressure guide covers topping up; the expansion vessel is the usual reason pressure keeps wandering.

Remeha is stricter than most about dirt in the system. It prescribes a magnetic dirt filter on every installation, in the return pipe directly before the boiler, and says leaving it out can affect a warranty claim. If your Remeha has no filter, I’ll tell you; fitting one is a small job.

Reading a Remeha fault code

Remeha’s advice when a code appears is in its knowledge base: note the code, look it up in the user manual, fix what you can yourself, and call an installer for the rest. Its online Storingswijzer is written for certified installers and says so.

On the Ace models the codes have a structure, set out in the Avanta Ace user manual. The first letter tells you how serious it is:

• A: a temporary fault. The boiler keeps running and the letter disappears once the cause is gone.
• H: a temporary fault that clears itself when the condition ends, sometimes only after ten minutes.
• E: a permanent fault. The boiler stops. Press RESET for one second. If E codes keep appearing, Remeha says to contact an installer.

A few from the manual that I’m asked about:

• H.02.07: low pressure in the heating circuit. Top up, and have the expansion vessel and the system checked for leaks if it happens again.
• E.04.10: the burner failed to ignite after four attempts. Gas supply, gas valve, electrode, fan or a blocked flue, so engineer work.
• E.01.04: the flame was lost five times in 24 hours. Gas pressure, gas valve or electrode.
• E.01.17: no water flow. Pressure, air in the system, pump or circulation.

Older Avanta and Tzerra models show different codes, so look yours up in the manual that came with the boiler, or send me a photo of the display and the type plate.

What I do on a Remeha service

Remeha publishes a maintenance checklist for each model, and I work through the one for yours. The Tzerra checklist, for example, has me:

• check the casing, the gas circuit, the combustion circuit and the fan
• check the hot water flow rate and clean the plate heat exchanger if the boiler doesn’t reach it
• check the flue and air supply connection for tightness and recirculation
• clean the filters in the hydroblock and the magnetic dirt filter, and check the electrode and the burner
• clean and refill the siphon, and check the automatic air vent
• measure the gas supply pressure, the CO2 or O2 and the flue gas temperature
• check for leaks, the system pressure and the pressure in the expansion vessel

The rule Remeha prints on every checklist is that all gaskets of parts taken apart are replaced, which I do on every make anyway. On the Tzerra and Calenta, Remeha also describes a control pressure measurement to judge how dirty the heat exchanger is, which shows whether a clean is due before the boiler lets you know.

Noises on a Remeha

For ticking or flow noises in the pipes, Remeha’s own advice names air as a likely cause: bleed and top up as the manual describes, and call your installer if it carries on. My guide to boiler noises covers the sounds that aren’t air.

Repair, or replace?

For a fault, it’s €114.95 incl. BTW per hour, with no call-out charge, plus parts. A typical repair with a replacement part comes to around €300-€400 incl. BTW; boiler repair explains how a visit works.

A standard CW4 replacement is €1,995-€2,495 incl. BTW and a CW5 is €2,195-€2,795 incl. BTW, as guide prices; the fixed quote follows once I’ve seen the boiler, flue and pipework. New boiler cost explains what’s in that price, and boiler installation how the job runs.

Book a service or a repair

Send me a message on WhatsApp with your postcode, a photo of the type plate and, for a fault, a photo of the display and the pressure reading. I work by appointment, 08:00-16:00, seven days a week.

If you smell gas, leave the property and call 0800 9009 from outside. If a CO alarm goes off or you suspect carbon monoxide, get everyone outside and call 112.