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 TM 9-4120-430-14
0028 00
2.
Use a multimeter and check continuity. Set the lowest ohm to check continuity between terminals L1 to T1 and L2
to T2. All contacts should be open. If there is continuity, replace the relay. See schematic in WP 0040 00.
3.
Check continuity between terminals A and B. If there is no continuity, the coil is open. Replace the relay.
4.
Apply 24 V ac across terminals A and B and repeat continuity checks between terminals L1 to T1 and L2 to T2. All
three contacts should be closed. If there is no continuity, replace the relay.
Evaporator Fan Motor (K2) and Heater Element Relays (K3, K4, and K5)
1.
Tag and disconnect wire leads.
2.
Use a multimeter and check continuity. Set the lowest ohm to check continuity between terminals L1 to T1. All
contacts should be open. If there is continuity, replace the relay. See schematic in WP 0040 00.
3.
Check continuity between terminals 3 and 1. If there is no continuity, the coil is open. Replace the relay.
4.
Apply 24 V ac across terminals 1 and 1 and repeat continuity checks between terminals L1 to T1. All contacts
should be closed. If there is no continuity, replace the relay.
Electronic Box Thermostat (Figure 5)
1.
Remove and tag thermostat (3) wire from terminal board TB2-8.
2.
Apply a 24 plus/minus 5 V ac power source to the thermostat wire removed from TB2-8 and to terminal board TB2-
2.
3.
With temperature selector switch (S2) in COOLER position (full counterclockwise) and mode selector switch (S1)
in COOL position, warm the thermostat probe (4) by holding in hand.
4.
Check voltage (24 Vac) between terminal board TB2-2 and TB2-7.
5.
Replace if no voltage present.
6.
With temperature selector switch (S2) in WARMER position (full clockwise) and mode selector switch (S1) in
HEAT position, cool the thermostat probe (4) in ice bath.
7.
Check voltage (24 Vac) between terminal board TB2-2 and TB-2.
8.
Replace if no voltage present.
Wiring and Connectors
1. Leave soldered connections secure.
2. Check for continuity by touching the test probes of a multimeter set on low-resistance range, to the ends of wire
and/or the corresponding pin of connector. See WP 0038 00, wiring schematic diagram.
3. Replace pins and wire if not found.
REPAIR
Repair is accomplished by replacement of components.
0028 00-6
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