Cause
Troubleshooting
Remedy
6. Leak at soldered joints.
Locate the leak.
Drain the system of fluid, repair the leak.
If the leak is on the connection pipe to
the heat exchanger, also drain the refrig-
erant side.
7. Associated leakage in the con-
denser.
•
Check for lack of refrigerant in the unit.
•
Check by smelling at the safety valve
on the hot side, open the valve and
check.
If the condenser has a leak, replace it.
8. Leak at soldered joint on water
heater (only applies to DHP-AQ Maxi)
Locate the leak.
If there is a leak at the soldered joint,
replace the water heater.
9. Associated leakage on plate heat
exchanger (only applies to DHP-AQ
Maxi)
•
Check for lack of refrigerant in the unit
•
Check by smelling at the safety valve
on the hot side, open the valve and
check.
If there is leakage, replace plate heat
exchanger.
3.5.3
Noise
Table 15.
Problem – Noise problem in the radiator system
Cause
Troubleshooting
Remedy
1. Flexible hoses missing.
Flexible hoses must be installed according
to the instructions.
Install flexible hoses according to the
instructions.
2. Incorrectly installed flexible hoses.
Flexible hoses must be installed according
to the instructions.
Install flexible hoses according to the
instructions.
3. Installing/suspending pipes.
Check if vibrations are transmitted via one
of the pipe mountings in the installation.
Remove or move the mounting point or
install vibration isolating mounting
parts.
4. Circulation noise (whistling noise in
the heating system).
Check the heating system.
•
Closed valves, choke valves, adjuster
valves or other restrictions in the radia-
tor system can cause circulation noise.
•
Is the heating system correctly adjus-
ted for flow?
•
Too great a flow in the heating system
can cause circulation noise.
If the incorrect type of valve is used to
choke the flow, replace with the correct
type.
If the heating system is not correctly
adjusted, make adjustments.
Can the heating system be run at a
lower flow?
5. Clicking.
•
Check that the volume tank is installed
and has the correct dimensions for the
relevant system. See the installation
instructions.
•
Establish when clicking occurs, during
heating and/or in connection with
completed hot water production?
•
Locate the clicking noises.
A surge tank can be installed on the sup-
ply line to mix the hot water with the
existing, slightly cooler, water, before it
goes out to the radiators.
Try lubricating lead-ins in walls, ceilings
and floors with silicone spray.
Service instructions VMGFJ102 – 21
