Houstra Polimero A2 plate processor

I recently bought an A2 Houstra Polimero plate processor from a company that was closing down, the unit is in good condition exept that an electrical relay that controls the water heating element is not working and i have been unable to source this part.
Does anyone know where these parts can be bought?.
Any help and advice would be greatly appreciated.

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Are you sure it is a relay? There is a safety switch that triggers when the heater is turned on with an empty bath. On the A4 it is located directly below the tank, and you take off the back panel to reset the switch.
This is described in a brief instruction sheet over in the Files section of the yahoo photopolymer letterpress group, https://groups.yahoo.com/neo/groups/PPLetterpress/files
being the third file listed under the Reference Materials subsection.
Unfortunately, Houstra is out of business.

Thank you Parallel Imp
I will ask my electrician to look for the re-set.
more anon