Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
EOGB QRB4 Photocell

EOGB

EOGB QRB4 Photocell

Photocell flame sensor for EOGB Siemens and Landis boilers, used to detect burner flame presence.

At a glance

  • Part type: photocell (flame detection sensor)
Manufacturer part no.
L01-QRB4B-B050B70A
Showing prices

£65.98

£54.98 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 QRB4 Photocell is a flame detection sensor supplied by EOGB for use on EOGB Siemens and Landis boiler applications. It monitors the burner flame and signals the control system when a flame is present, allowing the burner sequence to continue safely. The photocell is a serviceable component and is typically replaced when flame detection becomes unreliable.

Signs this part needs replacing

  • The burner fails to ignite and the control box locks out on flame failure.
  • Repeated lockouts occur after the burner has fired.
  • The boiler lights and then shuts down shortly after ignition.
  • Flame failure is indicated even though the burner is visibly operating.
  • Ignition becomes intermittent, with no other fault found in the burner sequence.

Before you order

  • Confirm the appliance model matches the EOGB Siemens - Landis fitment listed above.
  • Check the existing photocell reference matches QRB4 before ordering.
  • Inspect the photocell holder, lead and plug for contamination, damage or poor contact, as these can mimic a faulty sensor.
  • Isolate the electrical supply to the appliance before removing or fitting any component.

Not sure which part?

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