Hayward ED2 - AC Blower Vacuum Switch - Failed Closed

Heater System Solving Guide
FAULT CODE THUMBNAILS – PAGE F 2
FAULT CODE THUMBNAILS – PAGE F 2
Heater System Solving Guide
Fault Code Thumbnails AC Blower Vacuum Switch – Failed Closed
FAULT CODE THUMBNAILS AC BLOWER VACUUM SWITCH – FAILED CLOSED
UHS
AC
BLOWER VACUUM SWITCH – FAILED CLOSED
If the blower vacuum switch is closed before blower start-up,
the control module will not start the blower.
Pre-check is executed by the control module.
PARTS THAT MAY BE NEEDED
• Blower Vacuum Switch
• Control Module.
DIAGNOSTIC SEQUENCE
A. Disconnect the blower plug from the control module.
With the heater off, measure the control module receptacle’s
continuity across pins 1 and 2 (UHS, IDL2 & IDL) and pins 3 & 4
(IDL2 & IDL only). If either is closed, replace the control module.
B. If the relay is open, check the vacuum switch. If it is closed,
the blower vacuum switch failed and must be replaced.
IDL
IDL2