41
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RHP STANDARD_guide_21-03
Code
Message
Possible cause
User‘s actions
20A
Low extract air flow
1. Obstacle in the duct system.
2. VAV air flow control selected
but pressure sensors are not
connected.
3. Faulty exhaust air fan
1. Check that the air dampers, air intake and
exhaust openings are not blocked, check whether
the adjustment valves are not completely closed.
2. If VAV air flow control is required, install and
connect duct-mounted pressure sensors. If VAV
mode is not necessary – select CAV or DCV in the
settings.
3. Contact authorised service.
21A-23A
Electric heater
overheat
Electrical heater temperature
has risen above 100°C, because:
1. Supply air flow too low at high
heating demand.
2. Power failure during
operation of the electric heater;
the heater could not cool down.
3. Electric heater
malfunctioning.
1 a. Check the air duct system, air intake and
exhaust dampers, fan operation.
1 b. Decrease the desired temperature.
1 c. Increase ventilation intensity.
2. Check whether the unit is connected to the
mains.
3. Contact authorised service.
Once the fault is eliminated, reset an overheating
protection fuse before restarting the unit. Look
for a yellow sticker with the word “Reset” inside
the unit that marks an overheating protection
fuse.
24A - 27A
Evaporator air temp.
sensor failure
Air temperature sensor
upstream the evaporator not
connected or defective.
Contact authorised service.
31A-38A
Temperature sensor
failure
One of the additional zone
temperature sensors is faulty or
not connected.
1. Check if the sensor is connected. If a sensor
needs to be replaced, contact an authorized
service representative.
2. Check whether the auxiliary temperature zone
parameters are configured correctly (see Chapter
“Functions” or “Additional zone control C5” of the
Instruction Manual).
39A,40A
Return water temp.
low
Return water temperature of the
additional temperature zone
water heater dropped below the
permissible limit.
1. Check the condition of a circulation pump
and the heating system as well as operation of a
heating damper actuator. Check if hot water is in
the system.
2. Check that the auxiliary temperature zone
parameters are configured correctly (see Chapter
“Functions” or “Additional zone control C5” of the
Instruction Manual)
41A,42A
Supply air temp.
sensor failure
Not connected or faulty
temperature sensor inside
the unit, measuring supply air
temperature downstream the
heat exchanger.
Check whether the sensor is connected. If
a sensor needs to be replaced, contact an
authorized service representative.
43A,44A
External stop
The unit stopped by an external
device connected to the
additional zone module.
Once the additional device is stopped, the unit
will run in a normal mode.
45A
Water pump/
coil alarm
Signal from the water flow
sensor or circulatory pump
received (see “Water flow
monitoring function“).
Check if there is enough water in the system and
whether the circulation pump and water mixing
valves are working.
Summary of Contents for RHP Standard
Page 1: ...RHP Standard USER MANUAL EN ...
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