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Saunier Duval Overheat Thermostat 0020018477

Saunier Duval

Saunier Duval Overheat Thermostat 0020018477

Overheat thermostat for Saunier Duval Thema Condens and Themaplus Condens gas boilers, part number 0020018477.

At a glance

  • Part type: overheat thermostat
  • Appliance family: Thema Condens and Themaplus Condens gas boilers
  • Also known as 1416641
  • Consult a Gas Safe registered engineer if unsure
Manufacturer part no.
0020018477
Showing prices

£15.74

£13.12 ex. VAT · VAT at 20%

In stock
Order within 12m for same-day dispatch
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Saunier Duval overheat thermostat, part number 0020018477, is a safety device for Thema Condens and Themaplus Condens gas boilers. It monitors boiler temperature and interrupts the heating circuit if the appliance overheats. This thermostat is a gas boiler spare in the thermostats category.

Signs this part needs replacing

  • Boiler repeatedly locks out or requires resetting
  • Overheat fault code displayed on the boiler controls
  • Boiler fires then shuts down before reaching set temperature
  • No heating or hot water despite demand
  • Boiler cycling on and off frequently

Before you order

  • Check your boiler model against the fitment list above
  • Confirm the part number 0020018477 matches the existing thermostat
  • Check the GC number on your appliance if available
  • Consult a Gas Safe registered engineer if unsure

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.