A19
Brötje
Safety interlock open (e.g., limit thermostat, flue thermostat, external safety)
Boiler shows A19, safety chain open, no burner operation
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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.
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Possible Causes
Tripped manual reset limit thermostat, Open flue safety thermostat, External safety device (e.g., low water cut-off) open, Broken wiring in safety loop
How to Fix / Troubleshooting
Safety: Identify and correct the cause of any tripped safety before resetting.
- 1. Locate safety devices: On Brötje furnaces, safety thermostats may be mounted on the flow pipe, flue hood, or casing. External safety devices may be wired to dedicated terminals.
- 2. Check for overheat or flue issues: If a limit or flue thermostat has tripped, investigate pump operation, system flow, and flue blockage before resetting.
- 3. Reset thermostats: After cooling, press the reset button on manual reset thermostats.
- 4. Inspect wiring: Trace the safety loop wiring for loose connections or breaks.
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Repair Difficulty
Hard
4/5
Required Part
Limit Thermostat
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