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UPV75 Service Procedure VI – Blower Temperature Switch Testing and
Replacement
Blower Temperature Switch Replacement
Step 1. Position gas control power switch to the “OFF”
position and unplug heater from wall outlet.
Step 2. Remove the three screws (T20 Torx driver) from the control access cover on blower and
remove cover (see photo 16).
Step 3. Locate blower temperature switch (see photo 17).
Step 4. Disconnect red and blue wire leads from switch.
Step 5. Remove the seven T20 Torx screws from the blower top (photo 18). Then remove the top
of the blower (photo 19).
Step 6. Remove switch from blower housing.
Step 7. Install new switch. Be sure switch is properly seated in mounting area.
Step 8. Reconnect red and blue wires to new switch. Wires are interchangeable with either
terminal.
Step 9. Reinstall the blower top and all seven T20 Torx screws.
Step 10. Position gas control power switch to the “ON” position and verify proper heater operation.
Step 11. Replace control access cover from Step 2.
WARNING
115 volt potential exposure.
Use caution to avoid personal injury.
16
17
18
19
Blower
temperature
switch location
7 T20 Torx
screws
25
