Faults, Causes And Remedies; Fault Signals - Heating/Ventilation Hv Operating Mode; Fault Signals - Air-Conditioning Ac Operating Mode - Wilo Stratos 1.25x3-20 Notice De Montage Et De Mise En Service

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10 Faults, causes and remedies

Refer to the "Fault signal / warning message" sequence display and Tables 10,
10.1, 10.2 when handling faults.
Faults
Pump is not running
although the current
entry is switched on.
Pump is making noises.
Table 10: Faults with external fault sources
10.1 Fault signals – Heating/ventilation HV operating mode
• A fault occurs.
• The pump switches off, the fault signal LED (red steady light) switches on.
Twin-head pump: the standby pump is switched on.
• The pump automatically goes on again after a delay of five minutes.
• The pump is permanently switched off, FC relay opens and the PLR/LON/CAN
interface transmits the fault signal only if the same fault occurs for the sixth time
within 24 hours. The fault must then be reset by hand.
EXCEPTION: If the warnings "E10" and "E25" in HV operating mode are pending
for longer than 5 min, they are relayed as fault signals.
10.2 Fault signals – Air-conditioning AC operating mode
• A fault occurs.
• The pump switches off, the fault signal LED (continuous red light) is activated.
The fault signal appears in the display, FC relay opens and the interface PLR/
LON/CAN passes along the fault signal. The malfunction must then be reset
manually or via CAN.
Twin-head pump: The standby pump is switched on.
NOTE: Cod-Nrn "E04" (mains undervoltage) and "E05" (mains overvoltage) are
treated as faults only in AC operation and lead to immediate deactivation.
30
Causes
Electric fuse defective.
Pump has no voltage.
Cavitation due to insufficient
suction pressure.
Subject to technical alterations!
Remedy
Check the fuses.
Resolve the voltage inter-
ruption.
Increase the system admis-
sion pressure within the
admissible range.
Check the delivery head and
set it to a lower height if
necessary.
WILO SE 02/2011