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testing S1 voltage at condensor then it went bang

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Mitsubishi IND slim

Split system with 2 indoor cassettes.

Put my probes across S1 and the earth next to it from the 230v supply.
I was under the understanding that S1 was 208v-240v so was stunned when it went bang.

It blew a 6.5v fuse in the condenser board, replaced the fuse but now got e6 error and only 12v between S2 and S3

My question is, should it have blown between S1 and earth?:mad:

Tony

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