Weishaupt Heat Pump Error Codes & Fix Guide
Weishaupt Heat Pump Error Codes & Fix Guide (Ultimate HVAC Guide)
When a Weishaupt heat pump displays an error code, it’s not just a fault—it’s a high-precision diagnostic alert designed to protect the system and guide troubleshooting. Understanding these codes can help HVAC professionals and homeowners quickly identify issues, reduce downtime, and avoid expensive repairs.
This guide covers everything you need to know about Weishaupt heat pump error codes, causes, fixes, and advanced troubleshooting techniques.
About Weishaupt Heat Pumps
Weishaupt Group is a premium German manufacturer known for high-quality heating systems, burners, and heat pumps. Their heat pump range (like WWP, WWP LB, and Biblock series) is widely used in Europe for efficient and reliable heating solutions.
1. What Are Weishaupt Heat Pump Error Codes?
Weishaupt heat pumps use advanced controllers that continuously monitor:
- Temperature sensors
- Refrigerant pressure
- Compressor operation
- Water circulation
- Electrical systems
When a fault occurs, the system displays:
- F Codes / E Codes → Critical faults
- A Codes → Warnings or advisory messages
2. Types of Weishaupt Heat Pump Faults
Electrical Faults
- Voltage fluctuation
- PCB malfunction
- Relay issues
Sensor Faults
- Outdoor sensor failure
- Flow/return sensor issues
Refrigerant Faults
- Low refrigerant charge
- High pressure
- Compressor overheating
Hydraulic Faults
- Low water flow
- Pump failure
- Air in system
Communication Faults
- Controller communication error
- Bus system failure
3. Complete Weishaupt Heat Pump Error Code List
Critical Error Codes
| Code | Description |
|---|---|
| F01 | Flow temperature sensor fault |
| F02 | Return temperature sensor fault |
| F03 | Outdoor temperature sensor fault |
| F04 | Evaporator sensor fault |
| F05 | Condenser sensor fault |
| F06 | Discharge temperature fault |
| F07 | Defrost sensor fault |
| F08 | DHW sensor fault |
| F09 | Flow switch error |
| F10 | High pressure fault |
| F11 | Low pressure fault |
| F12 | Compressor overload |
| F13 | Expansion valve fault |
| F14 | Defrost failure |
| F15 | Freeze protection active |
| F16 | Pump failure |
| F17 | Communication error |
| F18 | Voltage fault |
| F19 | PCB fault |
| F20 | General system fault |
Warning Codes
| Code | Description |
|---|---|
| A01 | Temporary interruption |
| A02 | Defrost mode active |
| A03 | Compressor delay |
| A04 | Anti-freeze mode |
| A05 | System optimization |
4. Common Weishaupt Error Codes Explained
F10 – High Pressure Fault
Causes:
- Dirty condenser
- Blocked airflow
- Overcharged refrigerant
Fix:
- Clean outdoor unit
- Check fan motor
- Adjust refrigerant charge
F11 – Low Pressure Fault
Causes:
- Refrigerant leak
- Expansion valve issue
Fix:
- Leak detection
- Recharge refrigerant
F09 – Flow Switch Error
Causes:
- Low water flow
- Blocked filter
Fix:
- Clean strainers
- Check pump
F12 – Compressor Overload
Causes:
- High pressure
- Electrical imbalance
Fix:
- Check compressor current
- Inspect capacitor
F17 – Communication Error
Causes:
- Wiring issue
- PCB failure
Fix:
- Inspect connections
- Replace board
F16 – Pump Failure
Causes:
- Mechanical failure
- Electrical issue
Fix:
- Check voltage
- Replace pump
5. Advanced Troubleshooting Workflow
Step 1: Identify Error Code
Check display panel.
Step 2: Reset System
- Turn OFF power
- Wait 5 minutes
- Restart
Step 3: Basic Inspection
- Power supply
- Water pressure
- Filters
Step 4: Sensor Testing
- Measure resistance
- Compare with chart
Step 5: Refrigerant Diagnosis
- Check pressure gauges
- Inspect for leaks
6. Sensor Fault Diagnosis
Weishaupt systems use NTC sensors.
Common Issues:
- Open circuit
- Short circuit
Testing:
- Multimeter
- Compare resistance vs temperature
7. Refrigerant & Pressure Issues
Symptoms:
- Poor heating
- Ice formation
- Frequent shutdown
Causes:
- Gas leak
- Dirty coils
- Expansion valve issue
Fix:
- Leak repair
- Recharge system
- Clean coils
8. Electrical & PCB Faults
Common Codes:
- F17
- F18
- F19
Causes:
- Voltage fluctuation
- PCB damage
Fix:
- Install stabilizer
- Replace PCB
9. Communication Errors
Causes:
- Wiring faults
- Controller issues
Fix:
- Check cables
- Replace modules
10. How to Reset Weishaupt Heat Pump
Method 1:
Use reset button
Method 2:
Power OFF → Wait → ON
Method 3:
Reset via controller
11. Preventive Maintenance Checklist
Monthly:
- Check pressure
- Clean filters
Quarterly:
- Inspect wiring
- Test sensors
Yearly:
- Full servicing
- Refrigerant inspection
12. Pro HVAC Diagnostic Tips
Since you’re an HVAC professional, here are expert-level insights:
Superheat & Subcooling
- High superheat → low charge
- Low superheat → flooding
Delta T Monitoring
- Ideal: 5–10°C
Compressor Amp Check
- High amps → mechanical issue
Multi-Symptom Diagnosis
- High pressure + low airflow → dirty condenser
- Low pressure + frost → refrigerant leak
13. FAQ Section
Q1. What does F10 mean on Weishaupt heat pump?
It indicates high refrigerant pressure due to airflow restriction or overcharging.
Q2. How do I reset a Weishaupt heat pump?
Turn off power, wait 5 minutes, and restart.
Q3. Why does low pressure error occur?
Due to refrigerant leaks or expansion valve problems.
Q4. Can I fix error codes myself?
Basic issues can be fixed, but complex faults require professionals.
Q5. How often should servicing be done?
At least once per year.
Final Thoughts
Weishaupt heat pumps are premium systems known for durability and precision engineering. However, understanding error codes is essential for fast diagnostics, efficient servicing, and long-term reliability.
This guide gives you a complete professional troubleshooting framework to diagnose and fix Weishaupt heat pump issues effectively.
