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Need help with Bosch zwb42-3a combi boiler code
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Foxrider714
Member Posts: 3
in Gas Heating
Hey so I have a bosch zwb42-3a combi boiler that also does my DHW and had it installed about 5 years ago with no problems but over the weekend I got a code A7 and when I look it up it says it’s a temp sensor and would like to replace it myself but having a hard time finding the right on when I look it up in the book…also I never had any service done to it and having a hard time trying to find anyone in my area that even works in them.. is this something I can do I’m very good with tools and I’m also an electrician but not trying to pay an arm and a leg to swap out a sensor
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When I talked to Bosch they even told me should not need anything for about every 5 years.. sucks I called some shops on there site and they tell me they don’t work on them 🤷♂️.. so I’m just going to change it but I wanna make sure I get the right sensor and change the correct one0
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Book should give you correct ohm/temp readings.
You could check them all and find the one out of spec.0 -
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Ya I have to find it or look it up online.. like I said shows a code for A7 and when I looked it up it says DHW temp sensor.. so should only be one I just have to find the part number0
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check the wiring first for shorts..
part number is 871450011700 -
It is not very hard , drop and drain hot water pressure .Leaving the hot water drain open. Lift up the spring clip until it stops which holds the sensor in place , You will have to twist and pull out ,install the new sensor using a little silicone grease on the new o-ring to insert it fully .
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