Hayward ED2 - HS Maximum Return Water Temperature Exceeded

FAULT CODE THUMBNAILS – PAGE F 9
FAULT CODE THUMBNAILS – PAGE F 9
Heater System Solving Guide
Fault Code Thumbnails HS Maximum Return Water Temp Exceeded
FAULT CODE THUMBNAILS HS MAXIMUM RETURN WATER TEMP EXCEEDED
HS
MAXIMUM RETURN WATER TEMPERATURE EXCEEDED
UHS, IDL2, IDL, ED2
If water temperature exceeds 105°F, the heater will shut down and
go into lock-out.
Automatic restart is 2 minutes after water temp drops below 105°F.
PARTS THAT MAY BE NEEDED
• Control Module
• External Thermostat (if system uses one)
NOTE: In most cases, no replacement part will be needed.
DIAGNOSTIC SEQUENCE
A. Verify water flow is adequate.
Low water flow will cause high temperature.
(Generally, 25 gpm is needed by smaller heaters, while 300,000 btu/h
heaters may require 40 gpm or more. See heater’s operating manual.)
B. Verify set point setting of remote thermostat us below 108°F. If external
control is used, verify that external thermostat is set below 104
o
F. (Exter-
nal thermostat may be faulty and need to be replaced.)
C. Verify integrity of exchanger.
D. Check for possible bad ignition/control module.