Dimplex Heat Pump Error Codes & Fix Guide
Dimplex Heat Pump Error Codes & Fix Guide (Ultimate HVAC Guide)
When your Dimplex heat pump shows an error code, it’s not just a warning—it’s a built-in diagnostic system helping you quickly identify faults and prevent system damage. Whether you’re a homeowner, HVAC technician, or dealer, understanding these codes allows you to troubleshoot faster, reduce downtime, and improve efficiency.
This guide covers Dimplex heat pump error codes, causes, fixes, and advanced troubleshooting techniques.
About Dimplex Heat Pumps
Dimplex is a well-known brand specializing in electric heating and heat pump technology. Their heat pump range includes air-source, ground-source, and hybrid systems widely used across Europe.
1. What Are Dimplex Heat Pump Error Codes?
Dimplex heat pumps use intelligent controllers that continuously monitor:
- Temperature sensors
- Refrigerant pressure
- Compressor performance
- Water circulation
- Electrical systems
When a fault is detected, the system displays:
- Error Codes (E / F codes) → Critical fault
- Warning Codes (A codes) → Advisory
2. Types of Dimplex Heat Pump Faults
Electrical Faults
- Voltage fluctuation
- PCB failure
- Relay issues
Sensor Faults
- Outdoor sensor
- Flow/return sensors
Refrigerant Faults
- Low refrigerant
- High pressure
- Compressor overheating
Hydraulic Faults
- Low water flow
- Pump failure
- Air in system
Communication Faults
- Controller communication error
- Bus failure
3. Complete Dimplex Heat Pump Error Code List
Critical Error Codes
| Code | Description |
|---|---|
| E01 | Flow temperature sensor fault |
| E02 | Return temperature sensor fault |
| E03 | Outdoor temperature sensor fault |
| E04 | Evaporator sensor fault |
| E05 | Condenser sensor fault |
| E06 | Discharge temperature fault |
| E07 | Defrost sensor fault |
| E08 | Hot water sensor fault |
| E09 | Flow switch error |
| E10 | High pressure fault |
| E11 | Low pressure fault |
| E12 | Compressor overload |
| E13 | Expansion valve fault |
| E14 | Defrost failure |
| E15 | Freeze protection active |
| E16 | Pump failure |
| E17 | Communication error |
| E18 | Voltage fault |
| E19 | PCB fault |
| E20 | 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 Dimplex Error Codes Explained
E10 – High Pressure Fault
Causes:
- Dirty condenser coil
- Blocked airflow
- Overcharged refrigerant
Fix:
- Clean outdoor unit
- Check fan motor
- Adjust refrigerant charge
E11 – Low Pressure Fault
Causes:
- Refrigerant leak
- Expansion valve issue
Fix:
- Leak detection
- Recharge refrigerant
E09 – Flow Switch Error
Causes:
- Low water flow
- Blocked filter
Fix:
- Clean strainers
- Check pump
E12 – Compressor Overload
Causes:
- High pressure
- Electrical imbalance
Fix:
- Check compressor amps
- Inspect capacitor
E17 – Communication Error
Causes:
- Wiring issue
- PCB failure
Fix:
- Inspect connections
- Replace control board
E16 – Pump Failure
Causes:
- Mechanical issue
- Electrical fault
Fix:
- Check voltage
- Replace pump
5. Advanced Troubleshooting Workflow
Step 1: Identify Error Code
Check display panel.
Step 2: Reset System
- Power OFF
- Wait 5 minutes
- Restart
Step 3: Basic Inspection
- Power supply
- Water pressure
- Filters
Step 4: Sensor Testing
- Measure resistance
- Compare values
Step 5: Refrigerant Diagnosis
- Check pressure gauges
- Inspect leaks
6. Sensor Fault Diagnosis
Dimplex systems use NTC sensors.
Common Issues:
- Open circuit
- Short circuit
Testing:
- Multimeter
- Compare temperature vs resistance
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:
- E17
- E18
- E19
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 Dimplex 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 Logic
- High pressure + low airflow → dirty condenser
- Low pressure + frost → refrigerant leak
13. FAQ Section
Q1. What does E10 mean on Dimplex heat pump?
It indicates high refrigerant pressure due to airflow restriction or overcharging.
Q2. How do I reset a Dimplex heat pump?
Turn off power, wait 5 minutes, and restart.
Q3. Why does low pressure error occur?
Due to refrigerant leaks or expansion valve faults.
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
Dimplex heat pumps are reliable and efficient systems, but understanding error codes is essential for fast diagnostics, effective repair, and long-term performance.
This guide provides a complete professional troubleshooting framework to diagnose and fix Dimplex heat pump issues.
