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Andrews Relay RFF 'A' Series E633

Andrews

Andrews Relay RFF 'A' Series E633

Relay RFF 'A' Series, part number E633, for Andrews water heaters and hot water spares.

At a glance

  • Also known as 1821418
Manufacturer part no.
E633
Showing prices

£225.42

£187.85 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 Relay RFF 'A' Series is a control relay supplied by Andrews Water Heaters for use in their water heating appliances. It forms part of the appliance's electrical control circuit, switching the load demanded by the boiler or heater controls. It is listed within the Andrews hot water spares range.

Signs this part needs replacing

  • The appliance fails to fire or ignite when there is a call for heat
  • Burner or heater operation is intermittent, cutting in and out without a clear pattern
  • Audible chattering or clicking from the relay area during operation
  • No output to the switched component despite a confirmed control signal at the relay coil
  • Visible burning, pitting or discolouration on the relay terminals or contacts

Before you order

  • Confirm the appliance model and serial details against the manufacturer's parts list
  • Check the markings on the existing relay match the RFF 'A' Series designation
  • Isolate the electrical supply and verify the fault is at the relay before ordering
  • Inspect the relay base and wiring for damage that may also need attention

Not sure which part?

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