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Discuss What does the code Ou Er mean on EPH RFRP-OT thermostat in the Central Heating Forum area at PlumbersForums.net

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Cara Somer

What does the code Ou Er mean on EPH RFRP-OT thermostat?
 
I’m not familiar with EPH controls, but I suggest since your query hasn’t been answered to contact their technical support team.
 

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