Mitsubishi Electric ecodan ECOSLIM150L-PP-MEUK Installation Manual page 71

Troubleshooting
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No. Fault Symptom
11 Hot or warm water
from cold tap.
12 Water leakage
13 Heating system does
not reach the set
temperature.
14 In 2-zone temperature
control, only Zone2 does
not reach the set
temperature.
15 When a PUHZ-FRP
outdoor unit is
connected, DHW or
Heating operation
cannot run.
16 When a PUHZ-FRP
outdoor unit is connected
and is in heat
recovery operation,
the set temperature
is not reached.
(continued)
Possible Cause
Heat of hot water pipe is transferred to cold
water pipe
1. Poorly sealed connections of water
circuit components
2. Water circuit components reaching the
end of life
1. Prohibit, schedule timer or holiday mode
selected.
2. Check settings and change as
appropriate.
3. The temperature sensor is located in a
room that has a different temperature
relative to that of the rest of the house.
4. Heat pump not working.
5. Booster heater cut-out tripped.
6. Booster heater breaker (ECB1) tripped.
7. The booster heater thermal cut-out
tripped and can not be reset using the
manual reset button.
8. Incorrectly sized heat emitter.
9. Motorised valve failure
10. Battery problem (*wireless control only)
11. If a mixing tank is installed, the flow rate
between the mixing tank and the
hydrobox is less than that between the
mixing tank and the local system.
1. When Zone1 and Zone2 are both in
heating mode, the hot water temperature
in Zone2 does not exceed that in Zone1.
2. Faulty wiring of motorized mixing valve
3. Faulty installation of motorized mixing
valve
4. Incorrect setting of Running time
5. Motorized mixing valve failure
The outdoor unit is set to have operation of
the indoor unit of air conditioner take
precedence over that of the hydrobox, and in
the main controller settings "Electric heater
(Heating)" or "Electric heater (DHW)" is turned
off.
When the outdoor unit is set to have cooling
operation of the indoor unit of air conditioner
take precedence over that of the hydrobox,
the outdoor unit controls the frequency of the
compressor according to the load of air
conditioner. The DHW and heating run
according to that frequency.
Pre-Plumbed Slimline Cylinder Installation Manual
Explanation - Solution
Insulate/re-route pipework.
1. Tighten connections as required.
2. Refer to PARTS CATALOG in the service manual for expected part lifetimes
and replace them as necessary.
1. Check settings and change as appropriate.
2. Check the battery power and replace if flat.
3. Relocate the temperature sensor to a more suitable room.
4. Check heat pump – consult outdoor unit service manual.
5. Check booster heater thermostat and press reset button if safe.
Reset button is located on the side of booster heater, covered with white
rubber cap. (See component parts diagram in Installation manual of Hydrobox,
section 3. for position.)
6. Check the cause of the trip and reset if safe.
7. Check resistance across the thermal cut-out, if open then the connection is
broken and the booster heater will have to be replaced. Contact your
Mitsubishi Electric dealer.
8. Check the heat emitter surface area is adequate Increase size if necessary.
9. Check plumbing/wiring to motorised valve.
10. Check the battery power and replace it flat.
11. Increase the flow rate between the mixing tank and the hydrobox decrease
that between the mixing tank and the local system.
1. Normal action no action necessary.
2. Refer to "5.3 Wiring for 2-zone temperature control".
3. Check for correct installation. (Refer to the manual included with each
motorized mixing valve.)
4. Check for correct setting of Running time.
5. Inspect the mixing valve. (Refer to the manual included with each motorized
mixing valve.)
Turn ON Electric heater (Heating) or Electric heater (DHW) using the main controller.
Normal operation no action necessary. If Air-to-Water system is given priority in
operation, comp Hz can be regulated depending on the load of DHW or Heating. For
more details, refer to the PUHZ-FRP installation manual.
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