Kinetico UK
Flow / Pressure Interaction with Combi Boiler
Softener installed on a combi boiler system causes fluctuating hot water temperature or boiler lockouts.
Advertisements
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Advertisements
Possible Causes
Incorrect softener sizing for combi flow rate, Excessive pressure drop across softener, Incorrect bypass or plumbing configuration, Debris affecting boiler flow sensor
How to Fix / Troubleshooting
Safety first: Turn off boiler and follow boiler manufacturer's safety instructions before working on the system.
- Verify installation: Confirm the softener is installed according to Kinetico UK's guidelines for combi boilers, including correct pipe size and bypass arrangement.
- Check flow rate: Measure flow at a hot tap. If significantly below boiler requirements, the softener may be undersized or partially blocked.
- Inspect inlet strainers: Clean any strainers or filters before and after the softener that may be restricting flow.
- Consult sizing: If issues persist, consult Kinetico UK or your installer to verify that the model is suitable for your boiler's flow and demand.
Warning: Do not modify boiler internals; boiler issues must be addressed by a Gas Safe registered engineer.
Advertisements
Repair Difficulty
Medium
3/5
Advertisements