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flaky wirsbo control module

with two ganged wirsbo control modules(a 4 and a 3) managing 6 telestats and a circulator pump, i've discovered that when any of the 6 thermostats call for heat, the 6 associated telestats open when necessary, but the circulator pump fails to turn on. by jumping the contacts on the relay, i can force the circulator pump to come on: it simply fails to respond to the wirsbo control modules.

can a control module fail in this way? seems funny that both modules should fail simultaneously because either one should kick the pump on.


richard in new england


  • carol_3
    carol_3 Member Posts: 397

    I'm going to ask John Barba at Wirsbo what he thinks. Hang on--it could take a couple days for me to reach him.
  • carol_3
    carol_3 Member Posts: 397

    John says that terminals ES and ES coming out of the module are just a switch--no power. Do you have a power supply for the circuit made up of the switch ES/ES and the circulator pump?
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