On arrival found compressor and condenser off on control voltage, checked safety switches and both were closed. Reapplied power to see if 24v being lost somewhere else and system came on and was operating with very low suction pressure, head pressure normal. Checked blower and found fan spinning very slowly because belt was very worn and falling apart. Replaced belt and tested system. System now operating with normal pressures and temps, cooling properly. Materials used: 1 x A40 blower belt