Hayward ED2 - BO Bypass Operation (for external controls)

FAULT CODE THUMBNAILS – PAGE F 5
FAULT CODE THUMBNAILS – PAGE F 5
Heater System Solving Guide
Fault Code Thumbnails BO Bypass Operation (for external controls)
FAULT CODE THUMBNAILS BO BYPASS OPERATION (FOR EXTERNAL CONTROLS)
BO
BYPASS OPERATION (FOR EXTERNAL CONTROLS)
UHS, IDL2, IDL, ED2
The “bo” code is more of an information code than a fault code,
with the “bo” standing for Bypass Operation.
A “bo” code indicates the heater’s internal thermistor is disabled,
allowing the external thermostat control to operate.
This prevents any confusion between the two temperature-sensing
devices during heater operation — though the heater’s thermistor
will still prevent the heater for exceeding 104
o
F.