I'm trying to replace an old manual thermostat with a new digital thermostat for my line voltage baseboard heaters. If it's important, this particular thermostat simultaneously controls two separate baseboard heaters on opposite sides of a large room.
The hole in my wall has 6 wires, 3 black and 3 white (and a 7th ground wire, which I am ignoring for the purposes of my question). The wires come in black/white pairs from three corners. I am naming these corners α, β, and γ (alpha, beta, gamma). Thus the six aforementioned wires are αb and αw, βb and βw, and γb and γw.
The old double-pole thermostat seemed to function correctly. The wiring was as follows, where parentheses indicate a single solderless connector:
(L1, αb, γb)
(T1, βb)
(αw, βw, γw)
L2: unused
T2: unused
I thought it was strange that L2 and T2 were unused. When I wired my new double-pole thermostat I did as follows:
(L1, αb, γb)
(T1, βb)
(L2, αw, γw)
(T2, βw)
However, this new thermostat does not appear to be working. Did I wire it correctly?
I hope my notation is clear but I'm happy to edit if necessary. Thanks in advance for your help; much appreciated!