- TVs
- Projectors
TEMP Red
BenQ projector TEMP Red: high temperature or cooling fan
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
High
Quick answer
On BenQ MH741 and MH535, red TEMP can indicate high temperature, a fan error or a sensor error depending on the other lights. Check POWER, TEMP and LAMP; on MH741, if TEMP and LAMP light up because the lamp is too hot, turn off and let it cool for 45 minutes.
Safety first
Stop and check this first
- Open the lens shutter or remove the lens cap when the lamp is on. Do not block the lens with objects during operation: the MH535 manual warns that the objects may become heated, deformed or cause a fire.
- Refer servicing to qualified personnel. The MH535 manual prohibits replacing the lamp yourself and reserves that work for service personnel; the MH741 manual describes replacement without that restriction. Do not remove internal parts during this TEMP check.
Safe checks you can perform
- Allow the cooling process specified for your BenQ model
- Check the exact POWER, TEMP, and LAMP light combination against BenQ's indicator table
- Request assistance if the temperature warning persists
Leave these tasks to a qualified professional
- Do not attempt this professional task: Assistance based on the projector indicator combination
- Do not attempt this professional task: Dealer assistance if the MH741 warning remains lit
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Assistance based on the projector indicator combination
What they doThe MH741 and MH535 tables distinguish Temperature 1 error, fan errors and Thermal Sensor 1 open error using POWER, TEMP and LAMP. Communicate all three lights to your dealer; the MH741 table calls for dealer assistance if fans are not working and the projector shuts down again on restart.
They must show youthe model and the color, flashing or off state of POWER, TEMP and LAMP.
In writingthe complete observed light combination and whether the projector shut down again on restart.
Dealer assistance if the MH741 warning remains lit
What they doThe MH741 manual directs you to turn off and allow 45 minutes of cooling when TEMP and LAMP light up because the lamp is too hot. If TEMP or LAMP remains lit on restart, it instructs contacting your dealer. The manuals refer servicing to qualified personnel.
They must show youthe TEMP and LAMP states after the 45-minute cooling period on MH741.
In writingthe model, the persistent warning and the instructions received from the dealer.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Allow the cooling process specified for your BenQ model
- Who:
- You as the BenQ projector owner or operator.
- How:
- On MH741, if TEMP and LAMP light up because the lamp is too hot, turn off the projector and let it cool for 45 minutes. On MH741 and MH535, if you try to turn the projector on during the cooling process, wait until that process finishes before turning it on again.
- Result that matters:
- You allow the 45 minutes specified for that MH741 alert and avoid trying to start the projector while cooling continues.
- If the MH741 shows TEMP and LAMP because the lamp is too hot, complete the 45-minute cooling period before restarting.
- If the MH741 TEMP or LAMP indicator remains lit on restart, contact your dealer as the manual directs.
- Evidence to keep:
- Model, cooling time and POWER, TEMP and LAMP states on restart to communicate the alert to your dealer.
Evidence: Manual del usuario del proyector digital BenQ serie MH741 (Mantenimiento e indicadores) · BenQ MS535/MX535/MW535/MH535/TW535/TH535 Digital Projector User Manual · My projector is suffering auto shutdown, what can I do - BenQ Support FAQ
Check the exact POWER, TEMP, and LAMP light combination against BenQ's indicator table
- Who:
- You observing the three indicator lights on the BenQ projector.
- How:
- With LAMP off, POWER green and solid red TEMP indicate Temperature 1 error; POWER red and solid or flashing red TEMP indicate a fan error; POWER green and flashing red TEMP indicate Thermal Sensor 1 open error. On MH741, POWER green with TEMP red and LAMP red indicates a thermal break error.
- Result that matters:
- You match the complete light combination to the temperature, fan or sensor alert described in the model table.
- If POWER is red, TEMP is solid or flashing red and LAMP is off, record the fan error pattern when requesting assistance.
- If POWER is green, TEMP is solid red and LAMP is off, record Temperature 1 error; if TEMP flashes red with the other lights unchanged, record Thermal Sensor 1 open error.
- Evidence to keep:
- Photo or note of the exact POWER, TEMP, and LAMP light combination for your BenQ dealer.
Evidence: Manual del usuario del proyector digital BenQ serie MH741 (Mantenimiento e indicadores) · BenQ MS535/MX535/MW535/MH535/TW535/TH535 Digital Projector User Manual · My projector is suffering auto shutdown, what can I do - BenQ Support FAQ
Request assistance if the temperature warning persists
- Who:
- You communicating the model and indicator states to your dealer.
- How:
- On MH741, contact your dealer if TEMP or LAMP remains lit on restart after the specified 45-minute cooling period. Its indicator table also calls for dealer assistance when fans are not working and the projector shuts down again on restart. Refer servicing to qualified service personnel.
- Result that matters:
- You communicate the observed light pattern and restart behavior to obtain assistance.
- If TEMP or LAMP persists on MH741 after cooling, tell your dealer which indicators remain lit.
- If the projector needs servicing, leave that work to qualified personnel; on MH535, do not replace the lamp yourself either.
- Evidence to keep:
- Model and a note of POWER, TEMP and LAMP states, cooling and any repeat shutdown to share with the dealer.
Evidence: Manual del usuario del proyector digital BenQ serie MH741 (Mantenimiento e indicadores) · BenQ MS535/MX535/MW535/MH535/TW535/TH535 Digital Projector User Manual · My projector is suffering auto shutdown, what can I do - BenQ Support FAQ
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- TVs
- Brand
- BenQ
- Product type
- Projectors
Known code variants
- BenQ TEMP light red
- Error de Temperatura 1
- Fan 1 error
- Indicador TEMP rojo
- Indicator Temp lights
- Luz de advertencia de temperatura encendida
- TEMP Red
- TEMP Rojo
- Temperature 1 error
What it means
The BenQ MH741 and MH535 tables distinguish several red TEMP alerts: with POWER green and LAMP off, solid red TEMP means Temperature 1 error; with POWER red and LAMP off, solid or flashing red TEMP indicates fan errors; with POWER green and LAMP off, flashing red TEMP means Thermal Sensor 1 open error. On MH741, if TEMP and LAMP light up because the lamp is too hot, turn off the projector and let it cool for 45 minutes. If either indicator remains lit on restart, contact your dealer. Consult the indicator table for your model.
Warnings and stop conditions
- Highsource verified
Open the lens shutter or remove the lens cap when the lamp is on. Do not block the lens with objects during operation: the MH535 manual warns that the objects may become heated, deformed or cause a fire.
Evidence: Manual del usuario del proyector digital BenQ serie MH741 (Mantenimiento e indicadores) · BenQ MS535/MX535/MW535/MH535/TW535/TH535 Digital Projector User Manual · My projector is suffering auto shutdown, what can I do - BenQ Support FAQ
- Highsource verified
Refer servicing to qualified personnel. The MH535 manual prohibits replacing the lamp yourself and reserves that work for service personnel; the MH741 manual describes replacement without that restriction. Do not remove internal parts during this TEMP check.
Evidence: Manual del usuario del proyector digital BenQ serie MH741 (Mantenimiento e indicadores) · BenQ MS535/MX535/MW535/MH535/TW535/TH535 Digital Projector User Manual · My projector is suffering auto shutdown, what can I do - BenQ Support FAQ
Symptoms and causes
Probable causes · in order
- Temperature over the limit or a lamp that is too hotPossible
On MH741 and MH535, POWER green, TEMP solid red and LAMP off indicate Temperature 1 error. Both manuals also state that TEMP and LAMP light up if the lamp becomes too hot.
Evidence: Manual del usuario del proyector digital BenQ serie MH741 (Mantenimiento e indicadores) · BenQ MS535/MX535/MW535/MH535/TW535/TH535 Digital Projector User Manual · My projector is suffering auto shutdown, what can I do - BenQ Support FAQ
- Fans not working or running outside the desired speedPossible
With POWER red and LAMP off, solid or flashing red TEMP indicates fans not working on MH741. On MH535, those patterns identify Fan 1 error or Fan 2 error, respectively, because actual fan speed is outside the desired speed.
Evidence: Manual del usuario del proyector digital BenQ serie MH741 (Mantenimiento e indicadores) · BenQ MS535/MX535/MW535/MH535/TW535/TH535 Digital Projector User Manual · My projector is suffering auto shutdown, what can I do - BenQ Support FAQ
- Thermal Sensor 1 open error or thermal break on MH741Possible
POWER green, TEMP flashing red and LAMP off indicate Thermal Sensor 1 open error on MH741 and MH535. The MH741 table also identifies a thermal break error when POWER is green and TEMP and LAMP are red.
Evidence: Manual del usuario del proyector digital BenQ serie MH741 (Mantenimiento e indicadores) · BenQ MS535/MX535/MW535/MH535/TW535/TH535 Digital Projector User Manual · My projector is suffering auto shutdown, what can I do - BenQ Support FAQ
Virtual technician
Does TEMP Red still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Manual del usuario del proyector digital BenQ serie MH741 (Mantenimiento e indicadores)
BenQ · 2026 · official_doc
- 2
BenQ MS535/MX535/MW535/MH535/TW535/TH535 Digital Projector User Manual
BenQ · 2026 · official_doc
- 3
My projector is suffering auto shutdown, what can I do - BenQ Support FAQ
BenQ · 2026 · official_doc
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