User Guide

English
30 Subject to technical alterations!WILO SE 02/2011
10 Faults, causes and remedies
Refer to the “Fault signal / warning message” sequence display and Tables 10,
10.1, 10.2 when handling faults.
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 au
tomatically 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 oper
ating 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.
Faults Causes Remedy
Pump is not running
although the current
entry is switched on.
Electric fuse defective. Check the fuses.
Pump has no voltage. Resolve the voltage inter-
ruption.
Pump is making noises.Cavitation due to insufficient
suction pressure.
Increase the system admis-
sion pressure within the
admissible range.
Check the delivery head and
set it to a lower height if
necessary.