Atlantic fault code U1
Fault code U1 on an Atlantic heat pump (including Atlantic Aurea 5) means: Compressor overheat protection relay operated (1643XU): Compressor overheat protection relay. Reset the appliance once. If the code comes back, a part is usually faulty, often the compressor or inverter module. 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 U1 on an Atlantic heat pump indicates: Compressor overheat protection relay operated (1643XU): Compressor overheat protection relay.
Applies to
Atlantic Atlantic Aurea 5, R32 Hybrid Add On.
Fault code U1 on other Atlantic series
The same code does not mean the same thing on every series. Check the rating plate to see which series you have:
- U1 on Atlantic Aurea 5, R32 Hybrid Add On: Compressor overheat protection relay operated (1643XU): Gas leak.
- U1 on Atlantic Aurea 5, R32 Hybrid Add On: Compressor overheat protection relay operated (1242XU).
Matching parts
Atlantic parts are available from Instalpunt; shipping to EU countries from €17.95 (€24.95 for more distant countries), usually 3–5 working days.
Based on the cause, these original Atlantic parts fit (always check the type number of your appliance):
- Atlantic compressor € 1,740.95
- Atlantic compressor sensor € 41.95
- Atlantic compressor 100klt € 2,078.95
Further reading on this cause
Other Atlantic codes with the same cause
- 63 — Inverter fault
- 72 — Compressor temperature sensor fault
- 84 — Compressor current fault
- 95 — Compressor rotor position detection fault, compressor start fault
- A2 — Overcurrent protection action. DC current detection: Compressor.
- A3 — Compressor temperature protection
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 Atlantic heat pump fault code U1 mean?
Compressor overheat protection relay operated (1643XU): Compressor overheat protection relay.
How do I fix fault code U1 on an Atlantic 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 Atlantic fault code U1?
That depends on the exact cause. In the Atlantic parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code U1 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 Atlantic heat pump faults and codes at a glance →