I dont know whats up with yours, but I've had a lot of flukey timer issues in the past. Morry at dixmor said I had a massively high repair rate...
This old thread details some of the changes I made to fix some apparent electrical issues, maybe it will help.
I'm not certain, but I think the changes that likely had the biggest impact toward solving it were:
- In my limited life experience, I've learned to always check the fuse first, then check, doublecheck, and re-check the ground. So to totally eliminate grounding issues as a possibility, I added a separate ground rod exclusively for 24V, and double checked it every frikin ground wire on the property.
- replaced ALL 25 year old 24V transformers.
- moved all "extra" equipment from 24V bay transformers (eg weep, other relays, etc). At the same time I isolated ALL solenoids with a relay bank (yes I was desperate - I freely admit this may have been overkill)
- replaced 30 year old control wire to bays (lots of corrosion and worn-though spots on the insulation - also wanted to add more functions)
electricity is like voodoo to me. I understand it and can do it, but its still mystical.