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laars endurance no heat

storm1a Member Posts: 3
I have a

Laars Endurance combination boiler (EBP).  I recently had no heat and no hot

water.  The boiler would energize, fire, modulate just a little and then shut off, giving an F4 Error Code.  The repair technician changed the flow (supply)

sensor but that didn't correct the problem so they changed the internal or

system pump. Now I have hot water but no heat. Before the technician left he said that he got heat from all three zones in pipes but I get no heat by turning thermostat up. Please can anyone

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