Remeha fault code E03
Fault code E03 on a Remeha boiler (including Calenta and Calora) means: Flow temperature sensor open. Reset the appliance once. If the code comes back, a part is usually faulty, often a temperature sensor. You can check the water pressure and settings yourself; leave work on gas-carrying parts to a certified gas engineer.
After a safety alert (gas, flue gas, combustion), reset no more than once and call in a certified gas engineer. If you smell gas, call your national gas emergency number or 112 immediately.
Cause
Fault code E03 on a Remeha boiler indicates: Flow temperature sensor open.
Applies to
Remeha Calenta, Calora, Gas, Quinta, Tzerra, 115 PRO, 25L CW6, 25S Solo, 28C Combi CW4, 35S, 39 kW Combi, 40C Combi CW5, 40L Combi CW6, 610 connection set with plate heat exchanger, 610 connection set low-loss header, Plus M 24C Combi CW3, Plus M 28C Combi CW4, Plus M 39C Combi CW5, Pro 45 Solo, Pro 65 Solo, M 24c CW3, M 28c CW4.
Fault code E03 on other Remeha series
The same code does not mean the same thing on every series. Check the rating plate to see which series you have:
- E:03 on Calora Tower, Gas, 210 V2 80/120/160/200 kW, 220 SHL: Short circuit in the boiler flow sensor.
Matching parts
Remeha parts are available from Instalpunt; shipping to EU countries from €12.95 (€16.95 for more distant countries), usually 3–5 working days.
Parts per Remeha-series: Tzerra Ace · Tzerra · Avanta Ace · Avanta · Calenta Ace · Calenta · Quinta Ace · Quinta.
Based on the cause, these original Remeha parts fit (always check the type number of your appliance):
- Remeha sensor set 10k NTC 2x and double 10k NTC for Quinta Ace and Calenta Ace etc. € 35.28
- Remeha pressure sensor for Calenta and Calenta Ace etc. € 37.90
- Remeha grommet for flue gas temperature sensor 5 pcs (Quinta) € 16.34
Further reading on this cause
Other Remeha codes with the same cause
- 24 — Temperature sensor
- 31. — Flow temperature sensor fault
- 32. — Return temperature sensor fault
- 33. — Outdoor temperature sensor fault
- 34. — Temperature sensor fault
- 35 — Flue gas temperature sensor fault
Fix it yourself or call an engineer?
Always consult the manual for your appliance and work safely. If in doubt or if the fault comes back, call in a qualified professional. A question about a part? Write to us at info@instalpunt.nl.
Frequently asked questions
What does Remeha boiler fault code E03 mean?
Flow temperature sensor open.
How do I fix fault code E03 on a Remeha boiler?
First check the cause described above. Then restart the appliance using the reset button. If the message comes back, a part usually needs replacing or the fault needs to be repaired by a qualified professional.
Which parts do I need for Remeha fault code E03?
That depends on the exact cause. In the Remeha parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code E03 myself?
You can reset the appliance and check things like the water pressure or settings yourself. Work on gas-carrying parts must be left to a certified gas engineer.
All Remeha boiler faults and codes at a glance →