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Old 10-05-2020, 11:28 AM   #2
lwmcguir
Senior Member
 
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 1,158
THOR #9178
I have a unit prior to the Firefly so no help there

Has to be that the indicated output doesn’t connect to the Aquahot input

Does your zone 2 pump come on when system heat is selected?

Feel the pex line at the Aquahot and it should be 120 degrees or higher

Zone 2 is used as the stir pump since the 400D units don't have one that is dedicated

That should happen if the system is in the heat mode and the heat exchanger is hot
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