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TROUBLESHOOTING
to enable this feature. The unit will continue to operate when this error is displayed but the control
will ignore the outdoor reset feature and run at the programmed temperature. The bottom line of the
display will indicate the status of the pump.
Remedy:
Inspect wiring from outside sensor for damage or shorted connections repairing as necessary.
Measure resistance of outdoor sensor and compare to resistance chart. If not within range on chart,
shorted or open, replace sensor
Fault Code E07
CH SENSOR FAIL
PUMP ON
This display indicates that one or both on the clip on temperature sensors in the hydronic heating
module has been disconnected. This error will allow the tank portion of the unit to still operate, how-
ever it will not allow the hydronic heating module to operate until the error is cleared. The error will
clear if a proper connection is restored. The second line indicates the status of the pump.
Remedy:
1. Go to the STATUS menu screen that displays “CH Supply” on the Bottom Line . This will help
to determine which sensor has the error. If the temperature displayed is a reasonable number,
the error will be in the return temperature sensor (Horizontal Pipe). If the temperature dis-
played is not reasonable, they error will be in the Supply Sensor (Vertical Pipe).
2. Check the electrical connection to the thermistor on the outlet manifold, check the wiring har-
ness. If both are connected properly, replace the control. NOTE: Verify the themistor values by
referencing the Resistance Tables in Section 12.
3. Replace themistor if necessary.
Fault Code
ECS NOT CONNECTED
PUMP OFF
This display indicates that the main control board and the smaller ECS control board are not com-
municating properly. This error will allow the tank portion of the unit to still operate, however it will
not allow the hydronic heating module to operate until the error is cleared. The second line indicates
the status of the pump.
Remedy:
1. Check to make sure both ends of the ribbon cable are connected properly and securely in
place.
2. If both ends have a proper connection, check the ribbon cable for damage or wear. If any prob-
lems are found, replace the ribbon cable.
3. If problem still occurs with the new ribbon cable, replace the ECS board.
Fault Code
TEMPER BLOCKING
PUMP ON 12:31P
This display indicates a temporary hold on the burner ignition. This situation occurs when the top
tank sensor is above the set point and the bottom of the tank is substantially cooler than the top. This
is a temporary hold on the burner only and all other functions will remain functioning properly. This
error will clear itself when either the top tank temperature drops below the set point or the bottom
PART 12: TROUBLESHOOTING (CONTINUED)
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