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My 8 Zone radiant floor heating system is controlled by 2
Taco ZVC404-EXP Controllers. One is the Master and the other one is the
Slave. The system is 3 1/2 years old and has been working fine up until last
week. I noticed that some of the zones were not heating properly.
After further inspection here is what I found:
Master: Zone 1 is not working properly. When Zone 1 calls for
heat, the boiler starts, the zone valve opens, but the circulating pump does
not run. When zone 2, 3 or 4 call for heat, the boiler starts, the zone
valve opens and the circulating pump starts running (they are working
Slave: Zones 2, 3 & 4 are not working properly. When Zone 2, 3
or 4 calls for heat, the boiler starts, the zone valve opens, but the circulating
pump does not run. Zone 1 is working properly. When zone 1 calls
for heat, the boiler starts, the zone valve open and the circulating pump
Are both controllers bad and need to be replaced? Thanks for your help.