19
Pump not running.
"Pump" LED does
not light up*.
Power supply is interrupted. ► Ensure correct power supply.
Time switch function does not start the
pump. (BWO 155 Z)
► Check "Operating state" LED.
► Wait for next pump start.
► Change time setting.
Timer, p. 11
Temperature function does not start the
pump (BWO 155 ERT).
► Change shutdown temperature or wait for
next pump start.
Electronic regulating
thermostat ERT, p. 12
"Time" LED
ashes*.
Power supply was interrupted. ► Update time. Timer, p. 11
Pump is not
running: LED
"Pumpe" (pump)
is illuminated.*
Motor is defective (electrical/electronics). ► Replace motor.
Rotor is blocked because the rotor bearing is
defective.
Rotor is blocked by debris. ► Clean wetted parts. Maintenance, p. 15
Pump stops the
rotor continu-
ously.
Air in the pump housing, dry run protection
is active.
► Bleed the circulation line. Installation, p. 6 and
Venting, p. 9
Pump makes
noise.
Air in the pump housing. ► Bleed the circulation line. Installation, p. 6 and
Venting, p. 9
Rotor bearing defective. ► Replace the rotor. If the bearing pin is
damaged exchange the motor.
Replacement, p. 17
Non-return valve is loose. ► Exchange the V-type pump housing or non-
return valve installed behind the pump
(e.g. RV 153).
Installation, p. 5
Faults and remedies
► Observe the chapter “Safety” (see p. 3).
*only Pumps BWO 155 Z and/or BWO 155 ERT
Fault Cause Remedy Chapter/page