Applies to : All Marco Water Boilers
How to Descale Water Tank and Clean Water Level Probes
It is a common occurrence for limescale to build up in the tank of a water boiler. The amount of limescale build up is relative to the water hardness in a particular area.
The most common error indication on a boiler is the Ready light giving two red flashes between pauses, indicating that water can’t be seen in the tank. This can be caused by a number of issues, most commonly, limescale or film build up on the water level probes.
Isolate machine from power supply.
Isolate machine from water supply.
ALLOW TO COOL COMPLETELY!
Drain water from machine.
Remove all lids.
Remove as much scale as possible by hand, paying particular attention to level probes (White plastic with steel tab). Be very careful not to damage any attachments.
Use ScaleKleen, Marco part No. 8000270 or similar. Follow instructions carefully.
Thoroughly clean and flush the machine before re-use.
Follow installation and first time operation instructions
NB: Always clean the water level probes after descaling and rinsing the tank.
To Clean Water Level Probes:
Turn off unit at wall socket or unplug from wall socket
Remove top cover from boiler
Remove tank lid from tank
Identify water level probes – flat metal tabs inside water tank, normally 2 or 3 probes
Dispense as much water from unit as possible using tap
Thoroughly clean probes with ScotchBrite or scouring pad
Replace tank lid and top cover
Reconnect power to boiler and operate as normal