Owner’s Manual
Quantum Energy Technologies
Document number: QDC0030PD-16.4 Page 28 of 36
Appendix A: TROUBLE SHOOTING GUIDE ON QUANTUM WATER
Models covered in this guide
:
800 Watt. Compact and Split Air Source Domestic Hot Water Heater (0.8kW compressor models):
150/200-08ACW-134; 150/200-08ASW-134
1100 Watt. Compact and Split Air Source Domestic Hot Water Heaters (1.1kW compressor models):
270/340-11AC3-134; 270/340-11AC4-134; 270/340-11AS4-134
1700 Watt
.
Titan and Split Compact & Split Air Source Hot Water Heaters (1.7kW compressor models):
340-17ACW-134; 340-17ASW-134
A.1: No Hot Water; Compressor Not Running
Probable Cause
Test / Observation
Action
1. Power Failure
Check power supply, cable & connections.
If CB off refer to 2.
2. Circuit breaker (CB)
tripped off.
Check for short circuit (SC) in line or
wiring.
If circuit breaker trips off when compressor
re-starts, check compressor grounding and
winding resistance.
Remove line or wiring SC.
Replace compressor if found
SC.
3. Faulty / incorrect
capacitor.
Check capacitor operation if compressor
will not start.
Replace faulty or wrong
capacitor.
4. Compressor Seized.
Compressor will not start, draws high
current, or mechanically noisy when trying
to start.
Check the voltage.
Hit the compressor gently by a
wood hammer.
Replace compressor.
5. Thermal cut-out (TCO)
on digital controller
tripped off.
No power to compressor after thermal cut
out (TCO).
If TCO trips off repeatedly, see table “A2”.
Reset the TCO by pressing the
“
SET
” button on the digital
controller.
Check the gas amount from
sight glass.
6. Faulty water
thermostat.
Thermostat did not cut in even though
water temperature is below the restart point.
Electrical disconnection at the thermostat.
Check / replace water thermostat
or digital controller.
Reconnect or replace if faulty.
7. Compressor cuts out
on current overload
protector
Test for faulty capacitor.
Test for compressor short circuit /
compressor seized
Replace faulty capacitor
Replace compressor if faulty
A.2: Thermal Cut Out Trips Off Repeatedly
Probable Cause
Test / Observation
Action
1. Low refrigerant
charge.
Check refrigerant charge.
Test for possible leak in the refrigeration
circuit.
Top up refrigerant or re-charge.
Repair leak, or if not repairable,
contact QUANTUM service.
2. High refrigerant
charge.
Check refrigerant charge. Over charge
causes high current draw and excessive
head pressure resulting in a hot compressor.
Correct the refrigerant charge.
3. Incorrect voltage and
frequency.
Check power supply quality while unit is
running.
Rectify improper power supply
or shut off system and report to
the client.
