Hi there, I need help from BOSCH Experience exports those who have knowledge about this BOSCH. We have BOSCH T9800SE 160K BTU Machine, and we have Heating problem from last full Winter 2022-2023. When Heating ON it will blow Cold Air, but some time Hot Air Blow shortly (to get this Heating work I need to leave TAP or SHOWER continuously open, during this time gpm shows like 0.7gpm etc).
When we check Water Flow Rate shows on Machine 0.3gpm or 0.4gpm while Heating ON (when there is no TAP or SHOWER ON).
We have RED ZONE DVS 600 Furnace, so Fix every thing on Furnace Side like.
-Replace New Heat Pump.
-Replace all Pipes in Loop.
-Install Drain Tap & Shut Off Valve on HWR (Hot Water return).
-Replace Air Bleeding Pin on Coil.
-Descale BOSCH Tankless Water Heater.
-Clean Water filter, Air Filter inside BOSCH Machine.
-we inspect Check Valve, Flow Control, In-Line Check Valve all clear.
-We did Air Bound Purge Air out from system & Loop etc.
-we check Domestic Water Pressure 65psi & Expansion Tank Pressure 70psi, all good.
-we increase Temp on Hot water Tank from 122 up to 140 degree.
We did many more practical Testing, After doing above this all, still Water Flow Rate shows 0.3gpm or 0.4gpm.
And there is no problem at all on Furnace side, only the problem need to Fix on BOSCH Machine. So I want to know, how to increase Water Flow Rate up to 0.9gpm at least to get Heating Work.
We spend 8 over months for doing above all Testing one by one, finally notice problem need to fix in BOSCH Machine.
Please help us to fix, we have good Knowledgeable about BOSCH Machine.
Any Task please give us, we will do practical Test and Post in this Thread by Photos etc.
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