Underfloor Heating: Replacement for WLTA-19 thermostats.

[lochnagar]

Hi, can anyone recommend suitable replacements for WLTA-19 2-wire room thermostats? Two of mine have stopped working. OJ electronics no longer makes them, and they haven't been able to identify any replacements. The manual for my WLM Hydronic control system (also OJ, and also discontinued) states:-

"Thermostats requiring a 230 V or 24V live & neutral must NOT be connected. Only OJ thermostats type WLxx that are prepared for 2 wire or
wireless communication can be used."

IHS (the company that originally installed my underfloor system) has closed down. This all leaves me a bit stuck. Can anyone suggest replacement thermostats, or do I need to replace my whole control system?

 

[Gasguru]

Have you tried speaking to Rehau...it would appear they also use(d) the OJ bus system thermostats.