RDE20.1Room thermostat with 7-day time switch and LCD

Siemens RDE20.1 Underfloor Heating Controller – Faults, Issues & Same-Day Replacement

Is your Siemens RDE20.1 underfloor heating controller giving you trouble? Many homeowners experience recurring issues with older Siemens RDE20.1 units, especially as they age or develop internal faults. If your underfloor heating is not behaving as it should, we can help.

Common Problems Customers Search For

• Siemens RDE20.1 not turning off– underfloor heating stays on continuously

• Underfloor heating overheating the floor

• RDE20.1 display not working / unresponsive

• Siemens thermostat shorting out

• Underfloor heating not turning on at all

• Burnt-out Siemens RDE20.1 controller

• Old Siemens RDE20.1 stopped functioning

These symptoms usually point to internal relay failure, water ingress, age-related component damage, or short-circuiting inside the controller. When this happens, the heating may either never start or never shut off, creating comfort issues and potential safety concerns.

Our Solution – Instant Same-Day Replacement

Sparky G provides same-day replacement for faulty Siemens RDE20.1 units across Auckland.
Our certified electricians can quickly diagnose the fault and install a modern, reliable thermostatic controller that restores safe, accurate temperature control to your underfloor heating system.

Why Choose Sparky G for Your Replacement

• Fast same-day service - subject to availability

• Experienced electricians specialising in underfloor heating controllers

• Wide range of compatible replacement thermostats in stock

• Clean, efficient installation with minimal disruption

• Compliance-focused workmanship and professional advice

Get a Quote or Book a Service

If your Siemens RDE20.1 has stopped working, is overheating the floor, or the display has gone unresponsive, contact Sparky G today.
We’ll recommend the best replacement option and organise a prompt installation.

Get in touch now for a quote or to book service with our expert team.