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Triangle Tube provides DHW, but no heat

We received two calls this week from homeowners, one that has a TT Solo and the other has a TT Excellence (combi). They have DHW, but no heat. I jumpered the thermostat connections at the boiler; nothing happens. Thumbing through their literature, I looked for a DHW only vs. DHW/heating setting, but found none. Also disconnected the outdoor sensor even though it was below 68F without any response from the boiler. Any ideas?
Often wrong, never in doubt.