Sime
Sime Control Box 6210201 Honeywell S4565CF1045
Control box for Sime Format and OPEN gas boilers, supplied as Sime part 6210201 and built around the Honeywell S4565CF1045 control unit.
At a glance
- Also known as 2040774
£355.69
£296.41 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The CONTROL BOX - HONEYWELL S4565CF1045 is the burner control box used on Sime Format and Siemens OPEN gas boilers, listed under Sime part number 6210201. It houses the Honeywell S4565CF1045 control unit that sequences ignition, supervises flame detection and manages the boiler's safety lockout. It is a gas boiler control component from the Sime Controls range.
Signs this part needs replacing
- The boiler goes to lockout on a call for heat and will not reset reliably.
- The ignition sequence does not start, so the burner never attempts to light.
- Lockouts occur intermittently with no consistent fault pattern elsewhere in the boiler.
- The control box shows signs of heat damage, moisture ingress or burnt contacts.
- The boiler responds erratically to demand, running through part of a sequence and then stopping.
Before you order
- Confirm the boiler model against the fit list above, as Format and OPEN variants differ.
- Compare the part number on the existing control box with 6210201 and the Honeywell S4565CF1045 marking before ordering.
- Check that the fault lies with the control box rather than the flame sensor, ignition electrode or gas supply, since symptoms often overlap.
- Ensure any gas-related work is carried out by a competent, registered engineer.
Compliance
| Alternative numbers | 2040774 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| SIME FORMAT 20 BF CE IONO MET - 8092950 | — | — | — | |
| SIME FORMAT 20 CE IONO MET - 8092900 | — | — | — | |
| SIME FORMAT 25 OF C MET - 8092923 | — | — | — | |
| SIME FORMAT 25 OF MET - 8092906 | — | — | — | |
| SIME FORMAT 25BF MET - 8092969 | — | — | — | |
| SIME FORMAT 25BF TS GPL - 8092981 | — | — | — | |
| SIME FORMAT 25BF TS MET - 8092980 | — | — | — | |
| SIME FORMAT 30BF GPL - 8092961 | — | — | — | |
| SIME FORMAT 30BF TS GPL - 8092983 | — | — | — | |
| SIME OPEN 20 CE IONO MET - 8092104 | — | — | — |
Showing 10 of 13 compatible appliances.
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.
No documents held for this part. The technical team will source them from the manufacturer — usually the same working day.
No technical questions yet for this part.
Not sure which part?
Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.