On the display
The OptiView panel shows MOTOR - HIGH HOUSING TEMPERATURE. The manuals print the message in this wording only — there are no variants. It is listed among the panel's safety shutdown messages, so the unit is standing stopped while it is on the display.
What it means
The chiller has tripped on a motor temperature protection. This Safety Shutdown is set when the Motor Housing Temperature is greater than or equal to 185°F (85°C): the panel measured a motor housing at or above that temperature and shut the unit down so the housing cannot run hotter than the limit.
Why it appears
- Motor Housing Temperature greater than or equal to 185°F (85°C) — this set condition is the only cause the manuals give; no other causes are listed for this shutdown.
Setpoints and thresholds
- Shutdown (set) point: Motor Housing Temperature greater than or equal to 185°F (85°C).
- Release point: Motor Housing Temperature less than 158°F (70°C).
Reset and restart
The fault releases on its own once the Motor Housing Temperature falls below 158°F (70°C). Starting the chiller afterwards takes the two things the manual names, in order: the released condition, and the CLEAR FAULTS button pressed on the OptiView panel. The manual puts it as: The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed.
Both must be true — housing below 158°F (70°C) and faults cleared — before a start is possible.
Questions engineers ask
What does MOTOR - HIGH HOUSING TEMPERATURE mean on a YORK YMC2?
It is a safety shutdown message: the chiller has stopped because the Motor Housing Temperature was greater than or equal to 185°F (85°C).
How do I clear MOTOR - HIGH HOUSING TEMPERATURE on a YMC2?
Wait until the Motor Housing Temperature falls below 158°F (70°C), then press the CLEAR FAULTS button on the OptiView panel. The chiller can be started once the condition is released and the faults are cleared.
At what temperature does the YMC2 motor housing fault release?
The fault is released when the Motor Housing Temperature is less than 158°F (70°C). While the housing is hotter, the message stays set and the unit cannot be started.
Messages next to this one
Source
Written from the manufacturer's manuals for the YORK YMC2; every number and designation on this page is checked against them before publication. The row of the manual this message comes from:
All YORK YMC2 messages: fault codes · YORK YMC2 documentation · YORK manuals