If the system is Heat only, or if there is a jumper
between the "RH" and "RC" terminal of your
thermostat, then with the power ON at the fuse box,
touch the "G" wire to the "RH" terminal. The fan
should come on immediately and stay on. The rush
of air is usually easily heard.
If the system is Cool only, or if the system is Heat
and Cool and there are separate wires to "RH" and
"RC", and there is no jumper between them: then
with the power ON at the fuse box, touch the "G"
wire to the "RC" terminal. The fan should come on
immediately and stay on.
If the fan does not come on it is an indication that
there is a problem with your system. Check any
breaker o fuses that fed the 24VAC transformer that
powers your system
If persists, contact qualified service personnel for
aid in determining the fault.
To test gas or oil heating systems, take the "W" wire
off its terminal. With the power ON at the fuse box,
touch the "W" wire to the "RH" terminal for a couple
of minutes and the heater should come on and stay
on until the wire is removed.
To test cooling, remove the "G" and "Y" wires.
Connect them together with the "RC" for several
minutes to observe operation. The system should
come on and stay on. If the cooling fails to come on,
or comes on and off, the problem is in the system.
To test a heat pump system with an "O" wire, three
wires must be connected together with the power
terminal. The power terminal is "RH" and "RC" with
a jumper between them. With the power ON at the
fuse box, connect the "O" and "Y" or and "G" wires
to the "RH" terminal for a couple of minutes and the
unit should provide cool air. Wait at least 5 minutes
and repeat this test without the "O" wire. The unit
should provide Heat.
To test a heat pump system with a "B" wire, three
wires must be connected together with the power
terminal. The power terminal is "RH" and "RC" with
a jumper between them . With the power ON at the
fuse box, connect the "B" and "Y" and "G" wires to
the "RH" terminal for a couple of minutes and the
unit should provide warm air. Wait at least 5
minutes and repeat this test without the "B" wire.
The unit should provide cool air.
Contact your HVAC service company or our
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