Vaillant fault code F.824
Fault code F.824 on a Vaillant heat pump (including Hydraulisch station) means: Pressure loss in the emitter circuit due to leak or air pocket, emitter circuit pressure sensor defective. Reset the appliance once. If the code comes back, a part is usually faulty, often a temperature sensor. You can check the water pressure and settings yourself; leave work on gas-carrying parts to a certified gas engineer.
After a safety alert (gas, flue gas, combustion), reset no more than once and call in a certified gas engineer. If you smell gas, call your national gas emergency number or 112 immediately.
Cause
Fault code F.824 on a Vaillant heat pump indicates: Pressure loss in the emitter circuit due to leak or air pocket, emitter circuit pressure sensor defective.
Applies to
Vaillant Hydraulisch station, VWZ MEH 97/6 w _ VWL 35_6 A 230V, VWZ MEH 97_6 w _ VWL 105_6 A, VWZ MEH 97_6 w _ VWL 125_6 A, VWZ MEH 97_6 w _ VWL 55_6 A 230V, VWZ MEH 97_6 w _ VWL 65_6 A 230V, VWZ MEH 97_6 w _ VWL 75_6 A 230V.
Matching parts
Vaillant parts are available from Instalpunt; shipping to EU countries from €17.95 (€24.95 for more distant countries), usually 3–5 working days.
Parts by Vaillant series: ecoTEC plus · ecoTEC pro.
Based on the cause, these original Vaillant parts fit (always check the type number of your appliance):
- Vaillant sensor € 54.95
- Vaillant sensor € 112.95
- Vaillant Hall sensor € 61.95
Further reading on this cause
Other Vaillant codes with the same cause
- F.022 — Water pressure sensor defective, open circuit in the wiring harness, solenoid valve of…
- F.042 — Sensor not connected or sensor input short-circuited
- F.073 — Wire to the water pressure sensor is open circuit or has a short circuit
- F.086 — Contact S20 on the heat pump main PCB (HMU) open, incorrect setting of the maximum…
- F.094 — Flow rate sensor not connected or sensor input short-circuited
- F.1288 — Sensor defective or not correctly connected to the VWZ AI heat pump control module.
Fix it yourself or call an engineer?
Always consult the manual for your appliance and work safely. If in doubt or if the fault comes back, call in a qualified professional. A question about a part? Write to us at info@instalpunt.nl.
Frequently asked questions
What does Vaillant heat pump fault code F.824 mean?
Pressure loss in the emitter circuit due to leak or air pocket, emitter circuit pressure sensor defective.
How do I fix fault code F.824 on a Vaillant heat pump?
First check the cause described above. Then restart the appliance using the reset button. If the message comes back, a part usually needs replacing or the fault needs to be repaired by a qualified professional.
Which parts do I need for Vaillant fault code F.824?
That depends on the exact cause. In the Vaillant parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code F.824 myself?
You can reset the appliance and check things like the water pressure or settings yourself. Work on gas-carrying parts must be left to a certified gas engineer.
All Vaillant heat pump faults and codes at a glance →