Replacement Of The Thermistor; Replacement Of The Safety Thermostat - Hitachi YUTAMPO Series Service Manual

5 Servicing
Indoor unit

5.2.5 Replacement of the thermistor

1 Remove the screws (x4) of the heater cover and the
heater cover.
2 Disconnect the thermistor from the PCB (CN4
connector).
3 Remove the thermostat bulb -3- and the thermistor -2-
from the same sheath -1-.
3

5.2.6 Replacement of the safety thermostat

The safety thermostat is used in case of water gets too
hot.
1 Open the ebox and disconnect all the terminals
connected to the thermostat.
2 Remove the external nut -1- that fixes the thermostat to
the electrical box.
3 Remove the screws (x4) of the heater cover and the
heater cover.
4 Remove the thermostat bulb -2- and the capillary -3-
from the sheath -1-.
55 SMGB0135 rev.0 - 06/2020
4 Install new one thermistor.
a. Insert the thermistor -2- through the hole of the
b. Apply conductive silicon grease in the sheath -1-
c. Insert the thermistor -2- inside the sheath.
1
d. Insert the thermostat bulb -3- inside the sheath -1-.
e. Connect the thermistor to the PCB (CN4
f. Mount the heater cover and fix it with the screws
1
2
1
5 Pass the thermostat bulb through the hole of the heater
cover and remove the whole safety thermostat.
heater cover.
and thermistor -2- to guaranty the contact surface.
3
connector).
(x4).
2
3
1
2
1
1
5