Model FF-2500 Proportioning Unit
24
25942-1, Issue 4
Primary Heating System
Figure 14. Primary Heater Features
IMPORTANT: Heater shown with cover removed for troubleshooting purposes
only. Do not operate the proportioning unit with the cover removed.
Try the recommended solutions in the order given for each problem to avoid unnecessary
repairs. Also, determine that all circuit breakers, switches, and controls are properly set
and wiring is correct before assuming there is a problem. Turn off all switches and allow
the heater to cool before attempting troubleshooting procedures.
Problems Solutions
Heater Circuit Breaker trips.
1
No heat.
2
Controller displays the code Er1.
3
Controller displays the code Er2, Er3.
4
Controller displays the code Er4.
5
Partial heat, red light stays on continuously.
6
