Hey there,
I'm having problems w/ my heating (as discussed in a previous thread),
and I want to double check the connections between the thermostat and
the boiler isn't the problem. I'm almost sure the connection is fine
(the boiler clicks whenever I set the thermostat above the current
temperature, or below the current temperature), but I want to have
direct measurements that show me that the connection is solid. What is
the best approach to doing this?

I just purchased a multimeter, with the following idea in mind -- hit
the breaker on the power to the thermostat, disconnect the R & W cables
from the thermostat, place the multimeter to 50V DV (the thermostat is
24V, 50 the closest higher reading in the multimeter), flip the breaker
back on, and then place the black test lead on the W cable, and the red
test lead on the R cable. If my understanding is correct, this should
complete the circuit and my multemeter should read the voltage level.

Does this make sense, or am I misunderstanding how this works? I'm
working off of reading about cabling and doing electrical work, but all
the voltage meter docs I've seen are for wall sockets and such. I
thought I'd ping the experts before causing any havok.

Thanks