ERROR
CODE
MEANING POSSIBLE CAUSE SOLUTION
E79 Flapper does not close
A foreign body, or built up
contamination within the APS
apper house is present.
Clean the APS apper housing. If the problem
persists, then change the APS apper housing.
E81
Drift Test Warning
Description:
Temperature difference between CH Supply and CH
Return Sensors are monitored to detect micro crack in
the sensors.
a) Micro crack has developed on
the CH Supply Sensor, or the
CH Return Sensor.
b) Large electromagnetic eld is
affecting the electrical circuit.
c) Wire connections are loose.
a) Replace the damaged sensor
b) Investigate for electromagnetic disturbances
c) Replace the relevant wire loom in the boiler
E90 Communication Error Refer to manufacturer (Honeywell).
E94 DSP Firmware Problem
DSP has encountered serious
internal problem due to corrupted
content of non-volatile memory.
Replace DSP device.
E95 Cascade CH Supply Sensor Error.
There is no relevant data about
CH supply temperature coming
from the Controller, or the
Cascade Sensor.
Check connection of CH supply sensor on the boiler
body and the Cascade sensor in the pipeline.
E96 Outside Temperature Sensor (OTC) Error.
OTC control is activated by
sending OTC curve to non-zero
value and Outside Temperature
Sensor is not present
(open/short).
Check connection of Outside Temperature Sensor to
master DSP if OTC is used. Check if OTC curve is set
to zero when OTC is not used in the system.
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