Triangle tube prestige 110

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mark161

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Looking for wiring info using a Taco SR 503 switching relay with a prestige 110 boiler
 

Zl700

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Taco XX terminals is wired low voltage 18-2 wire to prestige TT terminals
 
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TerryP

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My TT boiler is cycling but it is skipping the space heating mode (3) and only heating the domestic hot water. The domestic mode (4) heats to as high as 204, according to the display, then shuts down having reached the temperature set point. The display then flashes 6200, followed by code b 18 (supply temperature too high). Am I not getting space heating because the supply temperature is too high?
 

Jadnashua

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It could be as simple as the temperature sensor for the IWH is not seated properly, or not working properly. Is the IWH temperature excessive?
 

Machinist

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Terry,
What was causing the issue with your TT skipping space heating mode? Is it a Prestige 110 that has been in service a while? A followup might be helpful for others.
 
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