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 refrigerant
side.
7. Associated leakage in the
condenser.
▪
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 DHP-AQ Maxi)
Locate the leak.
If there is a leak at the soldered joint, re-
place the water heater.
9. Associated leakage on
plate heat exchanger (only
applies to DHP-AQ Maxi
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 ex-
changer.
3.5.3
Noise
Problem – Noise problem in the radiator system
Cause
Troubleshooting
Remedy
1. Flexible hoses missing.
Flexible hoses must be installed according to the instruc-
tions.
Install flexible hoses according to the in-
structions.
2. Incorrectly installed flexi-
ble hoses.
Flexible hoses must be installed according to the instruc-
tions.
Install flexible hoses according to the in-
structions.
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 in-
stall vibration isolating mounting parts.
4. Circulation noise (whis-
tling noise in the heating
system).
Check the heating system.
▪
Closed valves, choke valves, adjuster valves or other
restrictions in the radiator system can cause circula-
tion noise.
▪
Is the heating system correctly adjusted for flow?
▪
Too great a flow in the heating system can cause cir-
culation 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 adjus-
ted, 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 supply
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
DHP-AQ
Danfoss Heating Solutions
VMGFJ202
21
