Trying to be brief and am not too well written- I have a 1999 utica dv125 gas fired hot water system. 3 zones controlled by 3 thermostats and 3 taco circ pumps. Also has a honeywell aquastat. Just added a taco sr504 exp 3 zone relay. I believe i wired the tekmar 256 correctly ( xx from relay to tekmar then 5/6 to boiler tt..now when i turn up a thermostat call for heat only the circulating pump for the zone calling turns on but the boiler doesnt fire). When i test the tekmar it does attempt to fire and indicate a boiler demand? Im sure im not explaining it correctly but any help is greatly needed. Someone had said that the gas valve may need to be “ split”...i’ve done diy on the boiler - mostly changing out new items where I just followed what was being replaced. Thanks for bearing with me.
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