13
Vokera
Return Temperature Rise Too Fast
Furnace shows 13, burner shuts down, may coincide with high system temperature
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
Bypass valve stuck open, Short-circuit in pipework, Incorrect system design, Pump speed too high
How to Fix / Troubleshooting
Safety: Isolate power before adjusting valves.
- Check bypass arrangement: If an automatic bypass valve is installed, ensure it is correctly set and not fully open, which can cause short-circuiting of flow to return.
- Inspect zone valves: Confirm that at least one heating circuit is open when there is a call for heat.
- Adjust pump speed: If the pump has selectable speeds, try reducing the speed one step to slow the temperature rise (qualified persons only).
- Consult installer: Persistent 13 faults may indicate a system design issue that needs professional review.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Automatic Bypass Valve
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements