Remeha fault code E 420
Fault code E 420 on a Remeha boiler (including Gas) means: Open circuit or short circuit of condenser inlet temperature sensor. Reset the appliance once. If the code comes back, a part is usually faulty, often the siphon. 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 E 420 on a Remeha boiler indicates: Open circuit or short circuit of condenser inlet temperature sensor.
Applies to
Remeha Gas, 35 A HP.
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.
For fault code E 420, the part involved is usually in the category: condensor.
Based on the cause, these original Remeha parts fit (always check the type number of your appliance):
- Remeha capacitor hydraulic pump € 80.19
- Remeha 25µF capacitor hydraulic pump € 137.27
- Remeha siphonless condensate drain € 254.15
Further reading on this cause
- Read the full explanation: water under the boiler – condensate or a leak?
- All siphons and condensate drains of all brands, with part number and price
Other Remeha codes with the same cause
- E 408 — Unit at E_12 and condenser inlet temperature rises by more than 10 °C within 1 hour.
- E 425 — Condensate drain blocked
- u 407 — Temperature measured by the condenser inlet sensor, flue gas sensor or generator fin…
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 E 420 mean?
Open circuit or short circuit of condenser inlet temperature sensor.
How do I fix fault code E 420 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 E 420?
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 E 420 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 →