I recently purchased a home (triplex) and in the basement unit, which is a one bedroom apartment, there are three baseboard heaters (bedroom, washroom, and living room).
The issue is that the living room heater has recently stopped working.
The previous owner of the house did all of the wiring by himself for this basement unit and I am now trying to figure out how it was wired and to ultimately get the living room heater circuit working again.
Below are pictures of the physical layout of the apartment as well as the wiring inside the electrical box for the living room thermostat.
Here are some of the details and findings during my troubleshooting:
- I noticed that there are three double-pole circuit breakers associated with the heaters and they are all connected the same way (ie: red/black wires line up in the same physical orientation).
- All circuit breakers measure 120V at each connection.
- I unscrewed the thermostats for all three heaters and measured 240V, 240V, and 120V respectively for the bedroom, bathroom, and living room (non functional) between the thermostat (single pole) connections.
- I noticed that all thermostats are connected to the red 12/2 wires. From what I've read and seen online, the standard is to connect to the black wires instead. So the wiring seems to be reversed (colour-wise), but at least it's this way for all of them so it should be OK to keep as is).
- I removed the living room heater from the circuit and disconnected the living room thermostat to leave bundles of wires as shown in the second picture.
- I measured 120V at the exposed living room heater wires. I re-measured the same 120V between the single red wire and bundle of black wires at the electrical box for the living room thermostat.
At this stage, because of too much destructive analysis, I am planning to install a brand new 240V heater. My question is how do I handle the connections inside the electrical box for the living room thermostat (refer to the picture)? Do I connect all the red wires together to obtain 240V? Or is there another underlying problem here?