Tuttnauer 3870M - Service Manual

Questions and Answers

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Paul PotterAug 14, 2025
What to do if the POWER indicator light doesn't light up on my Tuttnauer 3870M?
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  garzasergioAug 14, 2025
  If the main switch is in the START position but the POWER indicator light doesn't illuminate on your Tuttnauer Laboratory Equipment, first ensure the equipment is receiving power. Check the circuit breaker and lift the lever if it has tripped. If power is available, the main switch itself may be defective and require checking or replacement. You can test the bulb by setting the timer for 15 minutes and turning the multi-purpose valve to the DRY position; if the HEAT & DRY lights illuminate, the POWER bulb is likely burnt and needs replacement. If none of the lights turn on, there may be a fault in the electrical line, which needs to be checked and repaired from the entry point to the main switch.
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Julie ThompsonAug 18, 2025
Why is the pressure safety valve activated and heating continues in STE position in my Tuttnauer 3870M Laboratory Equipment?
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  Elizabeth RiceAug 18, 2025
  If your Tuttnauer Laboratory Equipment shows sufficient temperature and pressure, but the pressure safety valve is activated and heating continues while in STE position, it indicates that either the pressure switch (B10) is faulty and not stopping the heating at the required temperature, or the pressure safety valve itself is defective. In either case, the pressure switch (B10) should be fixed or replaced, and the pressure safety valve should be replaced if it's faulty.
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Megan ColeAug 21, 2025
What causes the temperature safety device to activate during sterilization cycles in my Tuttnauer Laboratory Equipment?
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  hmitchellAug 21, 2025
  If, during sterilization cycles, the temperature safety device is activated due to overheating in your Tuttnauer Laboratory Equipment, it could be due to several reasons. Check if the amount of water in the chamber is insufficient and add water as needed. Also, verify that the thermostat is set to the correct temperature. A leaking multi-purpose valve, which allows water to return to the reservoir, or a leaking safety valve, or excessive leaks from the air trap jet can also cause overheating. Replace these components as necessary.
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Roger WilliamsAug 28, 2025
How to fix water not entering the chamber when the multi-purpose valve is in FILL position in Tuttnauer 3870M?
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  Jesse DeckerAug 28, 2025
  If your Tuttnauer Laboratory Equipment's multi-purpose valve is in the FILL position but water isn't entering the chamber, there are a few potential causes. First, ensure the reservoir is filled with mineral-free water. If the reservoir is full, the multi-purpose valve or the pipe itself may be clogged. Follow the instructions in para. 11.10 to address these blockages.
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Daniel MartinAug 31, 2025
What to do if the HEAT light is not on in my Tuttnauer Laboratory Equipment?
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  Elizabeth HoffmanAug 31, 2025
  If the HEAT light is not on, while the multi-purpose valve is in STE position and the main switch is ON, and the Tuttnauer Laboratory Equipment is experiencing issues such as operating without heat, insufficient heating, or no heating at all, several factors could be responsible. If the bulb is burnt, replace it. If the pressure switch (B10) is set to too low a temperature, adjust it. A faulty Microswitch No.2 or Bridge No. 10 may also be the cause, requiring replacement or fixing, respectively. If there is no heating, the pressure switch (B10) or the safety thermostat might be faulty, necessitating repair or replacement.
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Christopher MartinezSep 3, 2025
Why does pressure build up very slowly in my Tuttnauer Laboratory Equipment?
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  Sara EricksonSep 3, 2025
  If the pressure builds up very slowly in your Tuttnauer Laboratory Equipment, several factors could be at play. One or more heaters might be burnt out, requiring inspection and replacement. Alternatively, there might be too much water in the chamber; verify the correct water level. A leaky door gasket could also be the culprit; try tightening it, and if the leak persists, replace the gasket. Lastly, the safety thermostat might not be set to the right temperature, causing it to halt heating prematurely; calibrate the thermostat accordingly.
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Brenda BentleySep 7, 2025
What to do if the door handle cannot be turned counter clockwise for opening Tuttnauer Laboratory Equipment?
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  tracy01Sep 7, 2025
  If the door handle of your Tuttnauer Laboratory Equipment cannot be turned counter-clockwise to open, it could be due to the door pin being set in the groove. Try slightly turning the handle in the closing direction (clockwise) and then attempt to open it again. If the problem persists, the door locking system may be stuck or the bellows damaged. Consult the “Pressure Door Lock System” section in the service section for further assistance. After opening the door, replace the bellows.
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James ContrerasSep 10, 2025
Why does dry operation not work on my Tuttnauer Laboratory Equipment?
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  Leslie ReynoldsSep 12, 2025
  If the dry operation does not work on your Tuttnauer Laboratory Equipment, it could be due to the dry microswitch MSw2 not being actuated or being faulty, in which case it should be replaced. Alternatively, the timer board might be faulty, requiring replacement as well.
E
Erica BaxterNov 23, 2025
Why are temperature and pressure insufficient when POWER and HEAT lights are lit in my Tuttnauer Laboratory Equipment?
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  William WestNov 23, 2025
  If your Tuttnauer Laboratory Equipment's multi-purpose valve is in the STE position, the POWER and HEAT lights are on, but the temperature and pressure are not sufficient, it could be due to several reasons: 1. The water level might be lower than required, so add water. 2. The pressure switch (B10) might not be calibrated correctly, so calibrate it. 3. Steam could be escaping from the safety valve; try pulling the safety valve ring for 2 seconds, then release; if the leakage continues, replace the valve. 4. The air trap jet hole might be leaking excessively, so replace the air trap jet. 5. Steam could be escaping from the door seal; tighten the door locking bolt, and if leakage persists, replace the door seal. 6. Steam could be escaping from piping connections; locate the leakage an...

Summary

1. GENERAL

1.1 Incoming Inspection

Verifies the autoclave's condition upon receipt.

1.2 Warranty

2. TECHNICAL DATA

2.2 Operating Condition

Specifies environmental and loading requirements for operation.

2.3 Technical Standards

2.6 Mains

2.10 Technical Specifications

Detailed technical specifications for each model.

2.11 Electrical Data

Provides electrical consumption and data details.

2.12 Symbol Description

3. DESCRIPTION OF COMPONENTS

3.1 Control Panel

Identifies and explains the function of control panel elements.

3.2 Other Components

Describes key external and internal components.

4. INSTALLATION, PLACING AND LEVELING INSTRUCTIONS

4.1 leveling

Step-by-step guide for correctly positioning the autoclave.

4.2 Water quantity for a cycle

Specifies the correct amount of water for sterilization cycles.

4.3 Lifting and Carrying

4.4 Loading and Unloading the Device

Guidelines for safely placing instruments inside.

8. MAINTENANCE INSTRUCTIONS

8.1 Preventive and Scheduled Maintenance

Outlines routine maintenance tasks for optimal performance.

8.2 Draining the Reservoir

8.3 Replacing the Door Gasket

8.4 Checking the Safety Valve

Periodic checks to ensure the safety valve functions correctly.

11. MAINTAINING AND REPLACING PARTS

11.1 Safety Tests after Repair

Electrical safety tests required after any repair work.

11.3 Cleaning and Replacing Air Trap Jet

11.4 Replacing the Safety Valve

11.5 Replacing the circuit breaker

11.9 Replacing Heating Elements

11.10 Replacing Multi-Purpose Valve

11.11 Unclogging the multi-Purpose Valve or Chamber

11.14 Replacing the pressure switch B10

Tuttnauer 3870M Specifications

General

Type	Autoclave
Trays Capacity	3
Chamber Material	Stainless Steel
Warranty	1 year
Power Supply	230V
Frequency	50 Hz
Temperature Range	105-134°C
Operating Pressure	2.1 bar