EWC Controls Forum

The board is configured for single unit combo heat & A/C unit with zone dampers.
In reality the actual system is 2 stage heat, where radiant heat is first stage. Only when there is a 5deg F. delta, will the second stage kicks on, but that's handled thru RC2000 T-Stats. To my recollection, controller ...

Guys and gals;
My BMPlus3000 which has been operating without any issus for few years, all of the sudden started calling for heat and cooling at same time.
This only happens when I call for heat. Y1 and W1 come on at same time, see attached image.
Calling for cooling works just fine.

Any ideas or ...

All that writing and such a simple answer.
Thanks Eric

Mario

Hello, we've been tasked with completing the electrical/control part of an installation where homeowner has 5 zone system and is using 3000 panel.

So first things first:

Current equipment already installed:
1. 3.5ton combo unit for forced AC/heat. (standard single stage AC & heat with fan)
2 ...