Hamworthy
Hamworthy Low Pressure Gas Switch 533901497
Hamworthy 533901497 low pressure gas switch (Honeywell type) for Purwell Variheat floor standing appliances, detecting gas pressure changes.
At a glance
- Part type: Pressure switch
- Also known as 45900438, 2064572
£71.52
£59.60 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 Hamworthy 533901497 is a low pressure gas switch built for Hamworthy gas appliances. It monitors gas pressure within the appliance and signals the control system when pressure falls outside the expected range, allowing the boiler to react safely to a change in gas supply or flow. It is supplied as a Hamworthy Spares item and is used across the Purwell Variheat floor standing range.
Signs this part needs replacing
- The appliance fails to fire and no ignition sequence starts despite a call for heat.
- The boiler locks out repeatedly, particularly on start-up or after a period of low demand.
- Operation becomes intermittent, with the burner lighting and dropping out without an obvious pattern.
- A low gas pressure fault is reported by the appliance controls.
- The switch shows physical damage, contamination or a sticking actuator when tested.
Before you order
- Confirm the appliance model and serial number against the compatibility list, as the same switch body can be used in several variants.
- Check any alternative number stamped on the existing switch, including 2064572, before ordering.
- On Purwell Variheat floor standing units, inspect the gas pipework and sealing washers around the switch and replace any that are disturbed during removal.
- Work on gas-carrying components must be carried out by a competent, registered engineer.
Mechanical
| Part type | Pressure Switches |
|---|---|
| Length | 0.1mm |
| Width | 0.1mm |
| Depth | 0.1mm |
Compliance
| Manufacturer part number (MPN) | 533901497 |
|---|---|
| Barcode / EAN | 533901497 |
| Alternative numbers | 45900438, 2064572 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| HAMWORTHY HAMWORTHY SPARE PARTS | — | — | — | |
| HAMWORTHY PURWELL VARIHEAT PV105HE FLOOR STANDING | — | — | — | |
| HAMWORTHY PURWELL VARIHEAT PV110C FLOOR STANDING | — | — | — | |
| HAMWORTHY PURWELL VARIHEAT PV125HE FLOOR STANDING | — | — | — | |
| HAMWORTHY PURWELL VARIHEAT PV140C FLOOR STANDING | — | — | — | |
| HAMWORTHY PURWELL VARIHEAT PV180C FLOOR STANDING | — | — | — | |
| HAMWORTHY PURWELL VARIHEAT PV65HE FLOOR STANDING | — | — | — | |
| HAMWORTHY PURWELL VARIHEAT PV70C FLOOR STANDING | — | — | — | |
| HAMWORTHY PURWELL VARIHEAT PV85HE FLOOR STANDING | — | — | — | |
| HAMWORTHY PURWELL VARIHEAT PV95C FLOOR STANDING | — | — | — |
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.
HAMWORTHY appliance manual — PURWELL VARIHEAT PV105HE FLOOR STANDING, PURWELL VARIHEAT PV125HE FLOOR STANDING, PURWELL VARIHEAT PV65HE FLOOR STANDING, PURWELL VARIHEAT PV85HE FLOOR STANDING
manualmanualHAMWORTHY appliance manual — PURWELL VARIHEAT PV110C FLOOR STANDING, PURWELL VARIHEAT PV140C FLOOR STANDING, PURWELL VARIHEAT PV180C FLOOR STANDING, PURWELL VARIHEAT PV70C FLOOR STANDING, PURWELL VARIHEAT PV95C FLOOR STANDING
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