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Hydronic switch open
9 E9 Hydronic switch open (if hydronic configured) - either the aquastat is defective, or the aquastat wiring is cut, or the aquastat is not present at all and the aquastat wires were not permanently connected together as per the set-up instructions.
I don't see this error code in the manual. I do see nP as an error code for Window Switch lockout. I just had this happen to me and they had me reset the control board.
Remove case, flick master switch to OFF for 10 seconds. Press Heat/Cool same time turn switch back on HOLD until off light comes on.
You should be fixed. Just had to do this for my unit. I was playing around with the settings and turned on the window switch option by accident.
Dear Friend! Er means Powerwas lost or voltage is low. Do you believe if volt meter shows correct volts, it's perfect? No, even loose contact of neutral,burnt wire, it shows correct volts in that point. Simple way to check the power is alright or not, just remove the a/c plug and connect any other device like electric racer, table fan, blower or iron box which work same volts as a/c. If other devices work, your power is o.k Or check for loose contact in your electrical wiring. Thanks.
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