Eliwell EZ-HT - Alarms and Diagnostics; Alarm Indication and Silencing; Alarm Causes and Remedies

DIAGNOSTICS
Alarms are always indicated by the buzzer (if present) and the alarm icon . To switch off the buzzer, press and release any key; the corresponding
icon will continue to flash.
N.B.: If alarm exclusion times have been set the alarm will not be signalled.
• E1: if the Pb1 probe is in error, the indication E1 will appear on the display.
• E2: if the Pb2 probe is in error, the indication E2 will appear on the display. (EZ-MT / EZ-LT only).
ALARMS
Label Description Cause Effects Remedy
E1
Pb1 probe
inoperable
(Cold room)
• Measured values are outside
operating range
• Probe inoperable/short-circuited/open
• Display label E1
• Alarm icon permanently on
• Disable max/min alarm controller
• Compressor operation based on
parameters Ont and OFt
• Check probe type (par. H00)
• Check probe wiring
• Replace probe
E2
Pb2 probe
inoperable
(Defrost)
• Measured values are outside
operating range
• Probe inoperable/short-circuited/open
• Display label E2
• Alarm icon permanently on
• The Defrost will end due to Timeout (dEt)
• Check probe type (par. H00)
• Check probe wiring
• Replace probe
AH1
Pb1 HIGH
Temperature
alarm
Value read by Pb1 > HAL after time of
tAO (see 'MAX/MIN TEMP. ALARMS')
• Recording of label AH1 in folder AL
• No effect on regulation
Wait until value read by Pb1
returns below HAL
AL1
Pb1 LOW
Temperature
alarm
Value read by Pb1 < LAL after time of
tAO (see 'MAX/MIN TEMP. ALARMS')
• Recording of label AL1 in folder AL
• No effect on regulation
Wait until value read by Pb1
returns above LAL