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Laars Endurance ebp have hot water but not heat

I have a Laars Endurance combination boiler (EBP) recently had no heat no hot water and kept getting F4 error code. Technician changed flow (supply) sensor. Didn't correct the problem so they changed the internal or system pump. Now I have hot water but no heat. Please can anyone help??

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Check the valve actuator honeywell zone valv

Posted on Dec 02, 2010

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Posted on Jan 02, 2017

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Combination boilers are called just that because they combine your hot water production and your space heating together with one boiler. The problem lies in the way that they produce hot water. To make the water hot, these boilers have a coil inside the chamber that the water for the space heating is held. The heat is transferred through the copper coil wall from the one water to the other.

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