“The wall mounted thermostat only has two wires connecting to the old nest thermostat, Your illustration shows 4 wires connecting to the new thermostat I thought the PEK used only two wires at the unit the reason for the extender?”
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Thanks for reaching out! It sounds like you may have a heat-only system, if you only have two wires. If this is the case, the PEK is not compatible, our PEK requires a "Y" wire, which connects to a compressor. We'd love to support you further with this! Can you reach out so we can determine the best solution for creating a "C" connection, which will be required to use an ecobee. You can give us a call at 1-877-932-6233 (or 647-428-2220 if you’re outside North America). Our team is also online Monday to Friday from 8 am to 11 pm EST, Saturday and Sunday from 9am to 9pm EST to answer your questions at https://support.ecobee.com/s/contactsupport
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