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Excessive Temperature Rise After Defrost

Likely causes

Defrost duration set too long

Check: Check controller defrost duration parameter — recommended summer 30~40 min, winter 15~20 min; excess setting causes temperature overshoot

What to do: Adjust defrost duration to match season; if termination sensor is normal, shortening saves energy

Defrost termination sensor malfunction — over-defrost continues

Check: Verify termination sensor (thermostat or NTC) operating temperature — thermostat normal operation +10~+13°C; NTC resistance 10kΩ at 25°C; deviation = failure

What to do: Thermostat: verify operating temp and adjust or replace; NTC: measure resistance with multimeter and replace if abnormal

No fan delay timer after defrost — warm air circulates immediately

Check: Check fan restart delay setting after defrost termination — recommended 3~5 min delay; no delay = heater heat circulates immediately

What to do: Set fan delay timer to 3~5 min; if unavailable, add auxiliary relay timer

Defrost cycle too frequent — exceeding daily defrost count

Check: Check daily defrost count — showcase recommended 4~6 times; excessive setting causes repeated unnecessary heat load and temperature rise

What to do: Optimize defrost count to 4~6 times daily; consider increasing if coil icing occurs (up to 6 times in summer)

Field tip

Defrost temperature recovery standard: return to within +2°C of setpoint within 30 min after termination = normal; if exceeded, shorten duration or adjust fan delay

All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.

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