Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
Hanicks
Basket
Andrews On/Off Switch E439

Andrews

Andrews On/Off Switch E439

On/off switch for Andrews water heaters and Supaflo EVO models, part number E439.

At a glance

  • Part type: On/off switch
  • Also known as 1821355
Manufacturer part no.
E439
Showing prices

£76.91

£64.09 ex. VAT · VAT at 20%

Available to order · 3 working days
Available to order · 3 working days
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 Andrews E439 is an on/off switch for Andrews water heaters and Supaflo EVO appliances. It controls the power supply to the unit, allowing the appliance to be switched on and off at the control panel. The switch is listed under the R300 reference.

Signs this part needs replacing

  • The appliance does not power on when the switch is operated.
  • The switch feels loose, stuck, or fails to latch in the on position.
  • Power cuts in and out during operation.
  • Visible scorching, cracking, or discolouration on the switch body.
  • No continuity across the switch terminals when tested.

Before you order

  • Confirm your appliance model against the fit list above.
  • Check the existing switch for the E439 part number or R300 marking.
  • Isolate the power supply before removing or fitting the switch.
  • Inspect the wiring and terminals for damage before fitting a new switch.

Not sure which part?

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