Mitsubishi Electric MSC-07RV-E2 Service Manual page 24

Unit operates HEAT mode even if it is set to COOL mode.
w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
Check of R.V. coil
X
<MUH-07/09/12RV>
Turn ON the power supply and operate
the indoor unit in COOL mode by pressing
the EMERGENCY OPERATION switch.
Yes
After 3 minutes, does the unit
operate in HEAT mode?
Yes
Is there 220-240V AC
between CN7211 – 2 on the
deicer P.C. board?
Yes
Replace the
deicer P.C. board.
No
Ok
No
Replace the R.V. coil.
24