Bosch IDS 2.0 User Manual

Service Manual Bosch IDS 2.0 | 43
Bosch Thermotechnology Corp. | 07.2021
Data subject to change
12.3.2 E4 Troubleshooting
LED display output: E4
Description: Temperature sensor fault (T3, T4, T5, Th, T3L, TF)
Possible causes:
 Temperature sensors failed – shorted or open (common cause)
 Wrong wire connections of sensor
 Ambient temperature beyond our operation range
Table 30
Procedure:
Figure 17
Restart system
Replace sensor
Yes
No
Yes
Correct the connection
No service required
No
Yes
Is the control board
wiring correct?
Is the T4 (ambient
temperature) <-4 °F?
Are temp. sensors
(T3/T4/T5/TH/T3L/
Tf) open or did it
short circuit?
No
1) See Section 13.4

Bosch IDS 2.0 Specifications

General

Brand	Bosch
Model	IDS 2.0
Category	Heat Pump
Language	English