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Johnson & Starley Transformer (MAF) 1000-0503690

Johnson & Starley

Johnson & Starley Transformer (MAF) 1000-0503690

Transformer (MAF) for Johnson & Starley Hispec J90 and J70-90 Mk2 warm air units, stepping mains voltage down for the control circuit.

At a glance

  • Part type: Transformer (MAF)
  • Also known as 1691221
Manufacturer part no.
1000-0503690
GC number
245-181
Showing prices

£143.70

£119.75 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 Transformer (MAF) is a Johnson & Starley electrical component used in the control circuit of Hispec J90 and J70-90 Mk2 warm air units. It steps the mains supply down to the low voltage required by the appliance's control and ignition circuitry. The MAF designation identifies the transformer variant used across these warm air models.

Signs this part needs replacing

  • The appliance fails to ignite or the control sequence does not start
  • No low voltage output at the transformer secondary winding
  • Intermittent or erratic operation of the controls
  • Audible buzzing, humming or signs of overheating from the transformer
  • Blown fuses on the low voltage side of the circuit

Before you order

  • Check the appliance rating plate to confirm the model and GC number
  • Confirm the existing transformer is marked MAF and matches the product code 1000-0503690
  • Inspect the wiring and fuses before assuming the transformer has failed
  • Verify the unit is a Hispec J90 or J70-90 Mk2 before ordering

Not sure which part?

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