Sunheat SH1500RC BB, Repair Manual, Page: 7 / 25

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How To Replace The High Limit Switch
!!Unplug Heater Before Servicing!!
(Remember That the Edges of the Metal Are Sharp. Use Caution)
Lay the metal unit on its right side (when you are looking at the back of the unit). Remove the
screws on the left side and lift the panel off. You should now see the 3 round copper heat
exchangers, 5 short quartz infrared heat tubes suspended inside of the copper exchangers, 1 long
heating element, and the circulation fan (Fan will be to your right). The High Limit Switch is a
thin black wire with a metal end. To replace the High Limit Switch you will need to unplug it
from the “
SP2 PT”
terminal on the circuit board. Remove the faulty switch and replace. Make
sure it is plugged back into the correct location (SEE PHOTO BELOW FOR HIGH LIMIT
SWITCH LOCATION).
Heating elements
High Limit Switch
Copper Heat Exchanger
Fan Switch
Fan
Power Routing Board
Circuit Board (not pictured)
High Limit Switch
Temperature Sensor