Troubleshooting - Dimplex ESSW2 Owner's Manual

Troubleshooting

Problem
The Solar Controller does
not turn on
The pump(s) do not turn on
(but controller has power)
Backup heat System
running when Solar system
should be running
Color of polypropylene
glycol has changed from
yellow to milky or black
Large Volume of Glycol in
pressure Relief collection
Tank
operating pressure is
dropping over time
Insufficient/Excessive
Pressure
38
Possible Cause
1. unit is not plugged in.
2. Circuit breaker has tripped.
1. System does not need
pumps on
2. Loose wiring
1. Temperature probes not
correctly installed.
2. Temperature probes not
reading correctly
1. pH of polypropylene has
decreased due to glycol
inhibitor degradation
1. Diaphragm in Solar Loop
Expansion Tank no is longer
working
2. Failure of pressure relief
valve
1. Leak in System (Solar Loop
operating pressure 4 bar,
Resting pressure 2 bar)
2. Large volume of liquid in
pressure Relief Collection
Containers
1. Leak in system.
2. Manual valves not in
appropriate setting.
Corrective action
1. plug unit in to outlet.
2. Check electrical panel.
1. pumps should only be running if
2. unplug unit and check pump connections inside of Solar
Controller
1. Check the installation of probes, ensure that they are
fully inserted into Solar Collector and Solar Storage tank.
2. Check the wiring to the Solar Controller, ensure that
wires are secure in Solar Controller input.
3. Temporarily switch connection points in Solar Controller
to determine if Temperature probes and Solar Controller
are functioning properly, replace defective probe(s) if
necessary.
1. Flush system of polypropylene Glycol and replace with
new solution. See Decommissioning and Commissioning
sections for instructions.
1. Briefly actuate the nitrogen valve, located on the top of
the tank, if nitrogen is released the diaphragm is still in
working order, if water comes out the expansion tank will
need to be replaced.
2. Contact installer to inspect the system.
1. Check for leaks and repair as necessary. If operating
pressure is still low, will need to add more liquid to
system (polypropylene glycol or Distilled water)
2. Check flow meter for air in viewer - release excess air.
3. problems with system/pressure relief valves, contact
installer to check system operating settings.
1. Check plumbing connections and repair if necessary
2. Adjust valves to proper settings
3. Contact Installer to inspect the system.
symbol is turning.
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