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Errors


Boiler type Mod con 850

Error code F06

Cause:

Return (inlet) temperature sensor exceeds 230ºF.

Solution:

- Check circulation pump operation. 
- Assure there is adequate flow through the boiler by accessing the status menu and assuring that there is less than a 50ºF rise from the return thermistor to the supply thermistor. 
- Check direction of flow on boiler circulator (see PIPING DETAILS in this manual). 
- Troubleshoot thermistor by following steps in F02.