Bosch HVAC system not working — is it urgent, who do I call?
Usually a tripped breaker, a failed capacitor, a bad contactor, or a thermostat fault.
Show us the system.
Snap a photo — see what it is, how urgent, who to call. One photo of the problem. fixRAgent reads it and gives you a Triage Profile.
Or start with a sentence
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In the next five minutes
Safe first steps, before the call. Nothing here needs a tool.
Switch the system off at the thermostat and at its breaker.
Take a photo of the unit and the thermostat, without opening anything.
Don’t use it again until it’s checked, and keep people away from it.
Everything else about this problem
Is it an emergency?
Is a Bosch HVAC system that isn't working an emergency?
Usually not, but it can be. Because this can be an emergency, leave it off and get it checked; don't reset it or turn it back on. It becomes urgent when the home is dangerously hot or cold for someone vulnerable; if you smell gas or burning, leave the system off, get out if you smell gas, and call 911 or the gas company.
If you manage this unit
Ask the resident
- Has its breaker tripped? If it has, leave it off; don't reset it.
- Is any smell, burning or gas, coming from it?
Who to call
An HVAC technician A tripped breaker goes to an electrician.
Symptoms & causes
Usually a tripped breaker, a failed capacitor, a bad contactor, or a thermostat fault.
When a Bosch HVAC system is not working at all, common symptoms include a completely blank thermostat display, no fan operation from either the indoor or outdoor unit, and no heating or cooling output whatsoever. The root causes often stem from a lack of power, such as a tripped circuit breaker, a faulty emergency shut-off switch, or a blown fuse within the unit's control board. Less commonly, a complete system failure can be due to a major component like the transformer or main control board failing, preventing any operational signals.
Questions people ask
Who do I call for an HVAC system that is not working?
An HVAC technician. Usually a tripped breaker, a failed capacitor, a bad contactor, or a thermostat fault. A tripped breaker goes to an electrician, and an outage in a temperature extreme for an older or unwell resident is a welfare call first. If anyone smells gas, everyone leaves the home now, leaves every switch as it is, and calls the gas utility from outside. The Triage Profile names who to call for your photo.
What do I tell the resident right now?
Thanks for telling me the HVAC system isn't working. Please check the thermostat, the breaker and the switch by the indoor unit; if the breaker has tripped, leave it off and tell me. If you smell gas, leave the home now, leave every switch as it is, and call the gas utility from outside, then call me. Send me a photo of the HVAC system and its panel and I'll get an HVAC technician to look at it.
Why is my Bosch HVAC completely dead after a power outage?
A power surge during an outage can trip a circuit breaker or blow a fuse within your Bosch HVAC unit.
My Bosch thermostat screen is blank, could this be the problem?
Yes, a blank thermostat screen often indicates a lack of low-voltage power to the thermostat or a complete internal failure of the thermostat itself.
What if the outdoor unit hums but nothing else happens?
A humming outdoor unit without fan or compressor operation usually points to a faulty start/run capacitor or a seized motor.
Related problems
More Bosch HVAC system problems
Another symptom on the same system.
Not working: other brands
Guides and hubs
A resident sent you this?
What a property manager should do when a resident reports AC not cooling: the first message, how urgent, who to send.
The manager’s checklist →Ask AI about this problem
Have the photo now?
Drop it in the box at the top. The Triage Profile says what it is, how urgent, who to call and what to say. Email the Triage Profile to yourself or share its link with the resident.