Trane TVR Pro CO Series Service Manual page 100

2.20 P5: Outdoor heat exchanger temperature protection
Digital display output
Description
 Outdoor heat exchanger temperature protection.
 All units stop running.
 Error code is only displayed on the unit with the error.
Trigger / recover condition
 Trigger condition: Outdoor heat exchanger temperature (T3) ≥ 65
 Recover condition: Outdoor heat exchanger temperature (T3) < 55
 Reset method: Resume automatically.
Possible causes
 Outdoor unit stop valves are closed.
 Temperature sensor not connected properly or has malfunctioned.
 Indoor load too large.
 System contains air or nitrogen.
 Poor condenser heat exchange.
 High pressure side blockage.
 Main PCB damaged.
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