Hello,
We have a thirteen year old system, installed in 2010: Triangle Tube Prestige Solo 175 paired with Turbomax109 indirect water heater, CH is also provided by the TT. Lately, about two months ago, when there is a demand for hot water (filling the tub for example) pressure in the system starts to drop quite significantly (from 20 psi to almost 0). At the beginning of the this problem TT would throw a b26 error related to LWCO, but I would bypass the LWCO by shorting the wires and system would build up the pressure back to normal during water heating cycle. Lately, though, the pressure started to drop more often with hot water demand and if the TT is idling and builds up back again when TT is heating DHW.
What could be the problem? Scale/sludge build up in the Turbomax? It was never flushed during the service through 13 years.
Thank you.