Sensor Malfunction - Carrier 51QPD009NS Service Manual

6.8.2. At non-defrosting situation, shaded pole motor always stops ; Compressor operates; Outdoor motor
is on at high speed. Then outdoor motor stops at a delay of 30s when compressor is off. When unit
is change for other mode(non-heating mode), Four-way valve shuts off at a delay of 2 minutes than
compressor.
6.8.3. Condition of entering into defrosting mode: when the operation time of T3(T3≤2℃ continuous) is
up to 2040minutes.
Defrosting motion: 1) Compressor operates; Four-way valve and indoor /outdoor motors shut off.
6.8.4 When meeting one of conditions as below, unit finishes defrosting motion.
1) The time of defrosting is up to 10 minutes.
2) TE≥50℃
6.8.5 Finishing defrosting motion: Outdoor motor is on, and compressor is off.
6.8.6 Compressor delay protection is invalid when unit entering into or finishing defrosting motion.
6.8.7 At heat pump mode, compressor/indoor motor/outdoor motor shut off immediately when water full
protection is on.
6.8.8 The ION/TIMER functions are valid at the heat pump mode.
6.8.9 Non-defrosting motion (for power management models):
The unit enters into the heat pump mode for the first time, four-way valve opens.
When compressor shuts off, the four-way valve closes at a delay of 10 minutes.
Compressor operates, and the four-way valve keeps opening.
When unit is on malfunction, four-way valve closes; Four-way valve resumes with the compressor
operating.

6.9 Sensor malfunction


LED display
E2
E1
E4
E3
P1
2) When TA﹥40℃ or time is more than 7 minutes, outdoor motor is on until
defrosting is over.
Stand for
T2 sensor malfunction
T1 sensor malfunction
Communication malfunction for display board and PCB
T3 sensor malfunction
Water full protection
15