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Discuss Honeywell ST6400C clicking and flashing in the Central Heating Forum area at PlumbersForums.net

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Mikegoldenballs72

Honeywell ST6400C
Hi, my Honeywell timer is flashing and clicking when both water and heating switched to auto or on together. And nothing works. Works if one or the other on. Believe 3 port on way out, makes a racket changing over. I’ve ordered one and changing over tomorrow. Just want to confirm right or is it likely to be the programer. Thanks for any advice
 

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