43
3064300_201703
Fault
Cause
Remedy
Leak in floor-standing
DHW cylinder
Flange leaking
Tighten bolts to a torque of 20-25 Nm, working
diagonally; replace gasket
Pipe connections leaking
Re-seal the connections
Heat-up time too long
Heating water temperature too low (measure at
floorstanding cylinder flow, not at heat generator)
Increase temperature (adjust controller)
Heating water volume too low (resulting in a wide
spread, i.e. return temperature too low)
Larger pump
Pay attention to back pressure from parallel
heating circuits
Internal indirect coil not vented
Vent several times with the pump switched off
Build up of scale on heating surface
Descale heating surface
Cylinder sensor not in sensor well
Check position of cylinder sensor
DHW temperature too low
Thermostat switches off too early
Thermostat or control unit
Adjust thermostat or increase set temperature
at control unit
Return temperature too low (e.g. spread too wide) Larger charging pump or increase speed of pump
in the appliance via the control unit
37. Troubleshooting – DHW cylinders
CEW-1-200, CEW-2-200, SEW-1, SEM-1W