Vaillant fault code F.519
Fault code F.519 on a Vaillant heat pump (including uniTOWER pure) means: Return temperature sensor on the heat pump defective or not connected. 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.519 on a Vaillant heat pump indicates: Return temperature sensor on the heat pump defective or not connected.
Applies to
Vaillant uniTOWER pure, VWL 107 7.2 IS S1 _ VWL 105 7.2 AS 230V S3, VWL 107 7.2 IS S1 _ VWL 45 7.2 AS 230V S3, VWL 107 7.2 IS S1 _ VWL 65 7.2 AS 230V S3, VWL 107 7.2 IS S1 _ VWL 85 7.2 AS 230V S3, VWL 107 7.2 IS _ VWL 105 7.2 AS 230V S3, VWL 107 7.2 IS _ VWL 45 7.2 AS 230V S3, VWL 107 7.2 IS _ VWL 65 7.2 AS 230V S3, VWL 107 7.2 IS _ VWL 85 7.2 AS 230V S3.
Fault code F.519 on other Vaillant series
The same code does not mean the same thing on every series. Check the rating plate to see which series you have:
- F.519 on Hydraulisch station, aroTHERM split, aroTHERM split uniTOWER, VWL 127 5 IS _ VWL 105 5 AS, VWL 127 5 IS _ VWL 125 5 AS, VWL 128 5 IS _ VWL 105 5 AS: Sensor not connected or sensor input short-circuited.
- F.519 on aroTHERM Monoblock, VWL 115/2 A 400 V, VWL 155/2 A 400V, VWL 55/2 A 230V, VWL 55/3 A 230 V, VWL 85/2 A 230 V: Sensor defective or not correctly connected to the main PCB.
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 for e.g. aroTHERM Pro VWL 75/7.1 A 230V 0020269357 € 20.26
- Vaillant temperature sensor € 31.36
- Vaillant sensor for e.g. uniTOWER VIH QW 190/1 E (0010019709) 0020187358 € 36.59
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.519 mean?
Return temperature sensor on the heat pump defective or not connected.
How do I fix fault code F.519 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.519?
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.519 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 →