Triangle Tube provides DHW, but no heat

Alan (California Radiant) Forbes

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?

Zman

Which controller is it?
With the old MCBA, if you held the wrong button down it would disable the heat or dhw. If i remember correctly it was the + or - buttons.

nosirra1Arrison

See page 16 - Top right of page for "shortcut" that was probably activated by accident
https://triangletube.com/getmedia/773a8c23-9f26-4a7e-ba4a-37d210d98fca/PS-Control-Supplement-5-MCBA.pdf?ext=.pdf

Alan (California Radiant) Forbes

@Zman and @nosirra1Arrison
Thanks, guys! I think that may be it.

Alan (California Radiant) Forbes

Parameter 3 had a setting of "00", "Burner and CH Pump Disabled". Changed it to "01", "Burner and Pump Enabled" and the burner kicked on.

Ever since a power surge, the boiler was only heating DHW.

Thanks again, gentlemen!