A17
Hoval
Safety interlock circuit open
Furnace shows safety chain open / safety loop error, burner inhibited
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
Tripped safety temperature limiter, Open flue gas thermostat, Faulty emergency stop switch, Loose wiring in safety loop on Hoval control panel
How to Fix / Troubleshooting
Safety: Do not bypass safety devices. Identify and correct the cause.
- Check emergency stop: Ensure any external emergency stop or boiler room safety switch is reset and latched.
- Inspect safety thermostats: Locate the STB and flue gas thermostat. If they have manual reset buttons, press them once after the system has cooled.
- Check wiring: Open the Hoval control panel and visually inspect the safety loop terminals for loose or broken wires. Tighten as needed.
- Reset controller: After confirming all safety devices are intact and reset, clear the error and test operation.
Advertisements
Repair Difficulty
Medium
3/5
Required Part
Safety Temperature Limiter (STB)
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements