Potterton
Potterton 21/18602 Puma full sequence control PCB
At a glance
- Also known as 1120857, POTTERTON21/18602
- Fitting must be carried out by a Gas Safe registered engineer
Showing prices
£141.60
£118.00 ex. VAT · VAT at 20%
In stock
Cut-off passed — dispatches next working day
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 21/18602 is a Potterton full sequence control printed circuit board, fitted to the Puma and Combi ranges. It manages the boiler's ignition sequence, modulation handover and safety monitoring throughout a firing cycle.
Signs this part needs replacing
- Boiler fails to complete its ignition sequence or locks out mid-cycle
- Intermittent shutdowns with no consistent fault elsewhere
- Fan, pump or gas valve stop responding correctly during firing
- Display or fault-code pattern points to a sequence control fault
Before you order
- Confirm the part number on your existing board matches 21/18602 or its earlier number 929689
- Isolate electrical power before removing the old board
- Fitting must be carried out by a Gas Safe registered engineer
Compliance
| GC number | 289-555 |
|---|---|
| Alternative numbers | 7625869091223, POTTERTON21/18602, POTTERTON21/18602, POTTERTON21/18602, 265075902345, 1120857 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| POTTERTON COMBI 100 | 47-393-04 | 47-393-04 | — | — |
| POTTERTON COMBI 80 | 47-393-03 | 47-393-03 | — | — |
| POTTERTON PUMA 100 E SIT / HONEYWELL CONTROLS | 47-590-13 | 47-590-13 | — | — |
| POTTERTON PUMA 80 E SIT / HONEYWELL CONTROLS | 47-590-11 | 47-590-11 | — | — |
| POTTERTON PUMA FLOWSURE PLUS | 47-590-18 | 47-590-18 | — | — |
Fitment listings are a guide, not a guarantee. Plant-room assemblies get modified on site more often than not. Send us the GC number off the data badge and a photo of the existing valve and we will confirm before anything is dispatched.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
manual
POTTERTON appliance manual — COMBI 80 (GC 47-393-03)
manualmanualPOTTERTON appliance manual — PUMA 100 E SIT / HONEYWELL CONTROLS (GC 47-590-13)
manualmanualPOTTERTON appliance manual — PUMA 80 E SIT / HONEYWELL CONTROLS (GC 47-590-11)
manualmanualPOTTERTON appliance manual — PUMA FLOWSURE PLUS (GC 47-590-18)
manualNo technical questions yet for this part.
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