Brand: MITSUBISHI ELECTRIC
Category: Other
Document Type: Manual
Language: EN
Manual for JT-SB116JH2-S-NA
Uploaded: Nov. 21, 2025, 7:21 p.m.
Manual Publish Date: 2017-04-01
9. Principles of operation
Descriptions of circuit operation
(1) Notes for turning the circuit breaker “ON / OFF"
- When the circuit breaker is turned "ON", the power lamp (LED1), heater lamp (LED2), and blue indicators (LED10, 11) turn on after 1.5 seconds, and the hand dryer becomes ready.
- The hand dryer will not operate before the power lamp turns on.
- Do not insert hands until the power lamp is on to ensure correct sensor sensitivity.
- When turned "OFF", the circuitry takes about 50 seconds to discharge voltage. Wait before maintenance.
(2) Hand detection and operation
- Infrared sensors detect hands.
- Blower motor turns on when hands are detected.
- Operation continues as long as hands are detected, up to 30 seconds.
- Operation resumes after hands are removed and reinserted if the 30-second limit is reached.
(3) Control of the heater
- Heater turns ON with the blower motor.
- Heater does not turn ON if the heater switch is OFF or if the room temperature is 89.6°F (32°C) or higher.
Troubleshooting and error codes
| Error Mode Display | Checkpoint | Check Method and Remedy |
|---|---|---|
| Power Heater (Lamps do not light.) |
Power supply voltage | Check that approx. 120 V AC is supplied at both ends of the power cord connections on the terminal block. If 120 V AC is not supplied, check: 1. Circuit breaker is ON. 2. Power cord is securely connected. |
| Power supply voltage on the power circuit board | Check that approx. 120 V AC is supplied between TAB1 and TAB2 (orange) on the power circuit board. If not supplied, check the following points:
|
|
| Connector dis-connection for the display circuit board | Check if connector CN19 (display) or CN18 (control) is disconnected. | |
| Connector discon-nection between the circuit boards | Check if connector CN2 (power), CN5 (control), or CN30/CN31 (filter) is disconnected. | |
| Malfunction of the control circuit board | If no error found after above checks, replace the control circuit board. | |
| Malfunction of the power circuit board | If the hand dryer does not operate after replacing the control circuit board, replace the power circuit board. | |
| Power Heater ☆ |
Dirty sensor window | Wipe the dirt off the sensor window. |
| Remaining foreign object | Check for objects in the hand drying area. | |
| Power Heater ☆ or ◎ |
Connector disconnection for the sensors | Check connectors CN12 (JT-30S3R), CN15 (JT-30S2R, 2 locations), CN11 (JT-30S1R), CN7/CN8 (control). |
| Malfunction of the control circuit board | If no error found, replace the control circuit board. | |
| Power Heater ☆ |
Motor malfunction | Check if the motor is locked. Turn smoothly by hand. |
| Malfunction of the power circuit board | If no error found, replace the power circuit board. | |
| Power Heater ☆ |
Blower (assembly) malfunction | Check for causes of motor overload (high voltage, objects disturbing motor). |
| Motor overload | Check if motor lead wire connectors (black, white, red) are disconnected. | |
| Power Heater ☆ |
Blown thermal fuse of the motor | Measure resistance between Red/White and Red/Black motor wires. If ∞ Ω, replace the blower (assembly). |
| Power Heater ☆ |
Malfunction of the power circuit board | If no error found after blower replacement, replace the power circuit board. |
| Abnormal power supply voltage (Overvoltage/Undervoltage detection) | Check for correct power supply voltage. Error occurs if approx. 170V AC or higher, or approx. 60V AC or lower. (Note: 170V AC+ may blow a current fuse on the power circuit board.) | |
| Power Heater ☆ |
Connector disconnection | Check if connector CN5 (control), CN2 (power), or CN30/CN31 (filter) is disconnected. |
| Malfunction of the control circuit board | If no error found, replace the control circuit board. | |
| Power Heater ● ☆ |
Replace the control circuit board. |