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If the stem moves freely but the flow is blocked
indicating the SPDT contacts have switched state
these part numbers are identical in technical specification and fitment
High Efficiency: Features an 11
Siemens Building Technology 188-0033 Thermostat 320074-702 If the stem moves freelyThe Siemens Building Technology 188 0033 is a specialized unit mounted hot water replacement thermostat engineered for high demand commercial heating applications. Designed specifically for hydronic HVAC heating control, this analog controller provides precise temperature regulation for terminal units including fan coils and unit heaters. As a critical HVAC replacement part, it enables contractors to restore legacy system performance without the