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Correction J2 HE = Electrical heater and HG for Gas heater.
Thanks

Right; I have found the 3A fuse on the circuit board and have replaced it. With the old thermostat installed, the system came back on. Thanks to all. Now I have a 5 wire system, to correctly wire the...

Right; the model number is 38br3048550. This is off the compreser and fan housing unit outside the house.
The old thermostate is made by ChaseRoberts no model or manufacture is shown.
I have...

Yes labeled the wires prior to removal
Green = G
Yellow = Y
Red = R
Blue = C
White = W
Wasn't sure about the RH and RC so I connected as to H = Red and C = Blue.
The jumper is set to HG for...

Just installed a honeywell thermostat model RTH230B. Connected as follows
Rh to Red
Rc to Blue
W to White
Y to Yellow
G to Green
Set J2 Jumper to HE
A/C failed to come ON. Checked Panel...