FDI P2131, Technical Manual, Page: 66 / 161

3.6 Alarm Code Troubleshooting Guide
ALARM
CODE
POSSIBLE CAUSES CORRECTIVE ACTION
Sustained
Alarm Tone
&
PLC Off
Liquid Level Switch
Malfunction & Unit
run with low or no
water
Plug / debris in
Liquid Level Switch
Plumbing & Unit
run with low or no
water
HTS ‐ 1 RTD Sensor
Failure
Turn the SMU OFF and disconnect power. Inspect Liquid
Level Switch. Does float move freely? Electrical continuity
of Liquid Level Switch with water? No continuity without
water? Replace liquid level switch or fix root cause of the
malfunction. Re ‐ qualify the switch per Operational
Qualification (OQ) of the Liquid Level Switch before placing
the unit back into service. See Section 3.1.
If Liquid Level Switch is functional, inspect plumbing that
leads to switch, including the heater flange tees, the hoses
and any other fittings. Remove blockage and flush hoses.
Re ‐ qualify the switch per Operational Qualification (OQ) of
the Liquid Level Switch before placing the unit back into
service. See Section 3.1.
Remove right ‐ side panel. Inspect HTS ‐ 1 INPUT LED and
STATUS SCREEN to determine if there is an input failure.
INPUT LED will turn red and STATUS SCREEN will display
“BROKEN WIRE”.
01
Cycle
Aborted
Operator pressed
Abort button
N/A
02
Low Water
Level
Water level in
jacket low
Add water to the jacket from the WRS, close and tighten
the chamber door, press “RESET,” wait for the jacket to
heat up, and restart the cycle. Also, recheck level in WRS
after pumping and refill if needed. Keep level in WRS at
the HIGH mark when jacket water level is at its HIGH mark.
WARNING: Service and maintenance work must be performed by qualified personnel only.
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