Coolant Alarm won’t stop

[Tigmaster]

Possibly covered before so apologies.
Recently purchased Bongo.
Removed idle control valve to clean it and in doing so lost about 1/2 pint of coolant.
I topped this up and since then the alarm won’t stop going off.
Coolant level is about 2cm and not losing any coolant.
I have tried cleaning both screws and also even connected both screws together with a wire and it still goes off.
I don’t know the make but I am guessing it is a fault with the alarm?

[Doone]

Is it a Haydn alarm?

[g8dhe]

Likely that the connections to the sensor(s) has been broken, there are normally some bullet connectors to enable threading the wires around maybe one of these has become pulled apart ?

[Tigmaster]

not sure what make of alarm it is.
It has 2 screws.
been for a drive today. When i got home i thought i would maybe test the wires near the alarm itself.
Plugged in back into the fuse and its all working ok now.
Its not going off unless i press the test button.

Will see how it goes

[Bob]

Most likely not a Haydn one if it has a test button.

[Tigmaster]

If I disconnect the battery the alarm will go off continuously when I reconnect it.
If I wait until the engine has warmed up properly and then plug in the fuse the alarm works fine.
Tried placing a wire from one screw to the other - makes no difference.
Tried a continuity led tester across the 2 screws and it lit up.
Tried again with a buzzer, it buzzed a couple of times but then wouldn't buzz again even though the led test showed a continuous flow.

Most odd.
I might have to replace the wires from the alarm to the coolant tank as they run through the bonnet rubber and could be damaged.