23
INSTALLER’S GUIDE
18-HE39D8-13A-EN
Check other
terminals for
shorting.
Replace MAS
Logic Module
has repeated
failures
Remove MAS
wires from "T" and
"T1" terminals on
logic module.
Measure
resistance from
either MAS wire to
cabinet ground
any continuity?
Yes
No
Honeywell W7459 Only - Troubleshooting - Logic Module Failures