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Errors


Boiler type CHS-399

Error code Hold 79

Cause:

Outlet high limit

1. CH or DHW settings
2. CH or DHW pump problem
3. Incorrect “Outlet high limit” setting
4. Incorrect “Outlet high limit response” setting. 

Solution:

1. Check if CH and/or DHW setpoint temperature plus off hysteresis exceed “High limit” setpoint – factory setting = 200°F (93°C). 
2. See "Inoperative CH or DHW pump" below.
3. Increase “Outlet high limit” setting; maximum setting = 200°F (93°C). 
4. Unless deemed unacceptable by local installation codes, the “Outlet high limit response” should be set to “recycle and hold” to prevent lockout.