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Andrews Blocked Vent Switch 7704052

Andrews

Andrews Blocked Vent Switch 7704052

Blocked vent switch assembly 7704052 for Andrews Hiflo EVO water heaters, used to shut down the appliance when the flue or vent is obstructed.

At a glance

  • Also known as 1823168
Manufacturer part no.
7704052
Showing prices

£47.74

£39.78 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 7704052 is a blocked vent switch assembly for Andrews water heaters. It monitors the flue or vent path and interrupts appliance operation when a blockage is detected, preventing products of combustion from entering the space. It is supplied as an assembly for the Hiflo EVO range.

Signs this part needs replacing

  • The appliance locks out or fails to fire, with the fault recurring after reset
  • The burner shuts down shortly after ignition without an obvious cause elsewhere
  • A fault indication relating to the flue, vent or combustion air path is displayed
  • The switch or its sensing connection shows corrosion, contamination or mechanical damage
  • The appliance will not run with the flue or vent confirmed clear

Before you order

  • Confirm your water heater model against the fitment list above
  • Check the part number on the existing switch matches 7704052
  • Inspect the flue and vent path for obstruction before assuming the switch is at fault
  • If your model is not listed, check it against the manufacturer's parts list

Not sure which part?

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