Replacing ST-2B with ST-2E

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Posts: 1
Joined: Sun Jan 19, 2020 3:52 pm

Replacing ST-2B with ST-2E

Post by Dwalsh »

Looking to replace a finicky ST-2B board and was told the replacement is the ST-2E.
However the ST-2E does not have a fan or system switch (cool / heat) on the board.
Is the ST-2E a direct replacement for the 2B even without the switches?

Also noticed A board with selector switches MCS-CXB. But no part number(s)

Is the part I need simply called ST-2E with remote selector switches?

Any help is greatly appreciated!
Steven W.
Posts: 40
Joined: Tue Jun 25, 2019 9:13 am

Re: Replacing ST-2B with ST-2E

Post by Steven W. »

Yes the ST-2E is the direct replacement for the ST-2B also

If you are looking for a Thermostat for the master zone on your ST-2E / ST-3E zone boards here is a list of Thermostats that have the separate "O" and "B" connections that you are going to need for the master zone. Remember the ST series boards are master/slave (Winter/Summer manual changeover) so you are going to need these two connections on your zone 1 thermostat for your board to work correctly.

EWC Thermostats
EWT-601-2 – None Programmable
EWT-725 - Programmable
EWT-855 - Programmable
EWT-855i – WiFi Thermostat
EWT-955WH – Wireless Thermostat

Emerson Thermostats

PRO 1 Thermostats
T601-2 – None Programmable
T725 - Programmable
T855 - Programmable
T855i – WiFi Thermostat
T955WH – Wireless Thermostat
Steven R. Weisneck
Technical Engineer
Tel: (732) 446-3110 Ext. #461
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