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Just reviewed the Honeywell link you supplied for the zone valve problem presented. I have a V8043E covered in the supplied link. This will be a big help in trying to loosen the valve. At first I...

I'm not sure so I'll answer here too. The part number for the Honeywell zone valve diaphragm is V8043E1012. It is a 24V 50,60 Hz W 0.32 amps @ 60 Hz diaphragm or valve.

Yes I found it: diagrams at this site showed exactly where to look. I needed a ladder.

Part number: V8043E1012 24V 50,60 HZ 6/5 W 0.32 amps @ 60 HZ

Thank you for your response. I just got home and I will look to find a better part number. The diagrams sent in give me a better idea where to look for the correct number.

Just got home. THank you for the information. I'll try to find a better part number.

How to replace, clean or free the diaphragm for a Honeywell heating zone valve
40004850-001. The diaphragm of the zone valve was replaced last Dec. 2011 and is not working again.

Mick

I just need to replace the diaphragm. It was replaced last Dec. 2011, It is not working again this year. It may be stuck. I would like to open it and see if I can free it with WD-40 or replace it...