aodhan
19-12-2010, 11:37 AM
Got called out to two panasonic urban multi a/c units model: U-10mx3x pqa.... Both units are joined together and 'y' kits are used inside to join into indoor units.... One unit went off and showed up fault code 'ja' discharge pressure sensor error... Checked for dc voltage between wire no.1 & 3 on connector x46a and was getting 2 volts dc which i think means pcb faulty but when i turn isolator off and restart both units run again.... Also outdoor coil was iced up so maybe its happening when unit goes on defrost? Left unit running and next day same fault code again and this time both outdoor units were off.... Any ideas on how best to check this fault... Thanks