Grundfos ALPHA 15-55 SUC HWR-D Comfort

11.5 There is a noise in the hydraulic system
There are no indicators lit on the pump or accessories.
Cause
Air in the system
Remedy
• Open a faucet or tap to let trapped air escape.
11.6 There is noise in the circulator pump.
There are no indicators lit on the pump or accessories.
Cause
Air is trapped in the pump.
Remedy
• Open a faucet or tap to let trapped air escape.
Cause
There is no water in the pump
Remedy
• Ensure there is liquid in the hot water supply source.
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