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Trouble Shooting - Bosch T5600S 12 D 23 Training And Service Information

Low nox instantaneous gas water heater / room sealed pressurized gas water heater for indoor installation
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8. Trouble Shooting

Error code
Error code definition
A0
Water temperature sensors defective
If a short or open circuit is detected on both water NTC
sensors the appliance will Lock.
Error is resolved when the sensor open or short circuit is
repaired.
A1/E4
Box temperature protection
If temperature inside the appliance box is over 70ºC,
appliance
must start reducing its maximum power 5% every 30s
until box temperature drops below 70ºC. During this time
the ECU must show a warning. If at any time the box
temperature
goes over 80ºC or power is reduced more than
20%, appliance locks. Function is only active 30s after
opening the water.
Power reduction is reset when water is closed.
Error is resolved by manual reset.
A4
Air temperature sensor opened circuit
If a short or open circuit is detected on the air temperature
NTC, the appliance shuts down and goes to lockout.
Error is resolved by manual reset.
A7
Outlet water temperature sensor defective
If a short or open circuit is detected on the outlet water NTC
sensor, a warning is shown.
Error is resolved when the sensor open or short circuit is
repaired.
C7
Signal from fan not received
When no feedback signal is received from the fan, the unit
goes to lock.
Error is resolved by manual reset.
CA
Water flow signal over specified maximum value
If the Control unit reads a water flow over the maximum
specified for the flow sensor (25l/min), appliance will lock.
Error is resolved when water flow is below 22 l/min again.
CF
Exhaust blockage
If a pressure above normal operating conditions is detected
on the exhaust by fan speed and/or consumption, the
appliance is locked.
Check configuration parameters like AS (altitude), F9 (flue
exhaust code), AP (appliance power), etc
Page 41 from 43
6 720 887 547 "SM FP_ErP MPP Europe 2018/08 en"
Error code type
Self-resolving
Warning/ Lock out
Lock out
Self-resolving
Lock out
Self-resolving
Lock out

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