Bosch BOVA-36HN1-M18M User Manual download pdf (Page 33)

Installation Instructions Bosch IDS BOVA | 33

Bosch Thermotechnology Corp. | 12.2016

Data subject to change

Error Code Description

P6 IPM module protection

H4 System lockup, 3 times (P6/L0-9) protection in 60 minutes

L0-L9 IPM module protection (the same as P6, only for analysis)

Table 22

When P6/L0-L9 appears occasionally, you don`t need to do anything, the system will

restart automatically after 6 minutes, of course, if you check the system of running,

it will be better.

P6/L0-L9 ( IPM module protection)

H4 ( System lockup, 3 times (P6/L0-9) protection in 60 minutes)

Diagnosis Handling

Check whether the service

valves are open

Yes

Check whether compressor

insulation resistance is greater

than 100KΩ

Yes

Check whether the resistance of

compressor U/V/W are normal

Yes

Check whether there is the

same fault

Open the service valves

Keep running

Yes

Replace the board and

check whether there is the

same fault.

Keep running

Yes

Replace the compressor and

check whether there is the

same faultt

Keep running

Replace the compressor

Check whether the compressor

wiring is normal

Reseat the wiring according

to wiring diagram

Replace the compressor

Figure 62

Error Code Description

AtL Ambient Temperature Limited

Table 23

When the ambient temperature returns to within the operating range, the

system recovery automatically.

AtL ( Ambient Temperature Limited)

Diagnosis

Handling

Yes

Check whether the ambient

temperature is beyond the range

cooling:40°F-120°F

heating:5°F-86°F

Normal

Check whether sensor T4 are

seated and normal (T4 for

Heat Pump only)

Unplug the sensor, Check

whether the resistance of T4

is in the range of Table 1

You need do nothing. Try to

start again

Reseat the sensor according

to wiring diagram

Replace the fault T3/T4

sensor

Figure 63

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