TM 10-5410-228-24
21. NO HOT AIR WITH INTERNAL (ECV) POWER `HYD OIL TEMP' ALARM OFF.
Turn ECV on.
NOTE: The heater will not run if the
Set ESS MODE selector switch to HEAT
ambient air temperature is
and TEMP CONTROL to HOT.
too warm to satisfy the
Turn override button on solenoid valve SV5
thermostat.
counterclockwise (see Fig. 1-9).
Push and hold override button on solenoid
valve SV7.
Check air flow temperature.
Check hydraulic valves
No
RD2 and RD3.
Does air get
Adjust or replace per
warmer?
Yes
Notify direct support if
Release solenoid
problem persists.
Replace solenoid
valve SV7.
valve per para
Yes
Remove connector plug
from solenoid valve.
Is
No
Does air get
Test for 24 Vdc across
24 Vdc
warmer?
connector plug pins.
present?
Yes
No
No
Push and turn override
Does air get
button on solenoid valve
warmer?
SV5 clockwise.
Yes
Replace solenoid
valve.
1