17
VMIFB202
Phase drop
Action:
Check that there is 230 V between incoming L2 on the circuit board and neutral on block 220.
Check if the overheating protection has tripped.
Check if any cables at the circuit board or overheating protection are loose or damaged.
Check that the thin, gas filled wire to the bulb is intact.
The overheat protection has tripped
Action:
Check if the overheat protection (T1) has tripped by pressing the red button until clicks.
The overheat protection breaks all input phases to the electric heating element.
If the overheat protection cannot be reset and the alarm remains, replace the overheat protection
No or insufficient circulation in the heating system
Action:
Check that the circulation pump rotates or if the circulation pump has jammed. If it has jammed open the bleed screw and try to release
the paddle wheel using a screwdriver for example (does not apply to optimum pumps).
Check that all the shut off valves are open, if not open all closed valves and taps
Check that the strainer is not blocked, clean if necessary
Check that there is no air in the heating system, bleed any air according to the installation instructions
Check that the supply sensor displays the correct value, see ohm table
Check that the return sensor displays the correct value, see ohm table
If both the HP and AH have deployed it is likely that there is a flow problem!
The submersible tube in the electric heating element is against the coils
Action:
Check what the flow temperature is when the overheating protection trips. This normally trips at 95°C.
The submersible tube can be withdrawn a few centimetres if the tube is too close to the coils in the heating element.
Troubleshooting Guide
Alarm Aux. heater
