Vaillant
Vaillant Expansion Valve 10033535
Vaillant expansion valve 10033535 for Arotherm PLUS /6 air source heat pumps.
At a glance
- Appliance family: Arotherm PLUS /6
- Also known as 1391490
£57.56
£47.97 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 EXPANSION VALVE is a Vaillant component (part number 10033535) used in the refrigerant circuit of Arotherm PLUS /6 air source heat pumps. It meters refrigerant flow into the evaporator, controlling the pressure drop between the high and low sides of the circuit. Correct operation is essential to the heat pump's ability to absorb heat from outdoor air efficiently across the operating range.
Signs this part needs replacing
- Reduced heating or hot water output from the heat pump with no obvious fault elsewhere in the system
- Refrigerant pipework at the outdoor unit frosting or icing abnormally during operation
- The heat pump failing to reach expected flow temperatures, particularly in cold ambient conditions
- Compressor short-cycling or repeated trips on high or low pressure protection
- Fault codes logged on the heat pump controller relating to the refrigerant circuit
Before you order
- Confirm the appliance model against the fit list, as the Arotherm PLUS /6 range covers several variants
- Check the part number on the existing valve or the appliance documentation matches 10033535
- Verify the diagnosis before ordering, since expansion valve symptoms can overlap with refrigerant charge, sensor and compressor faults
- Refrigerant circuit work must be carried out by a competent engineer holding the appropriate F-Gas certification
Compliance
| Alternative numbers | 1391490 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| VAILLANT aroTHERM PLUS /6 VWL 105/6 A 230V S2 (2020-2021) | — | — | — | |
| VAILLANT aroTHERM PLUS /6 VWL 105/6 A 230V S2 R1 (2022) | — | — | — | |
| VAILLANT aroTHERM PLUS /6 VWL 105/6 A S2 R1 (2022) | — | — | — | |
| VAILLANT aroTHERM PLUS /6 VWL 125/6 A 230V S2 (2020-2021) | — | — | — | |
| VAILLANT aroTHERM PLUS /6 VWL 125/6 A 230V S2 R1 (2022) | — | — | — | |
| VAILLANT aroTHERM PLUS /6 VWL 125/6 A S2 R1 (2022) | — | — | — |
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.
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