Running Information; Thermistor Reading; Summary Of Settings; Error History - Mitsubishi Electric EHSC-VM2B Service Manual

Running information

This function shows current temperature and other data of main component parts
of both the indoor and outdoor units.
1. From the Service menu highlight Running information.
2. Press CONFIRM.
3. Press F3 and F4 buttons to set the Ref. address. *1
4. Use the function buttons to enter index code for the component to be viewed.
(See the Table 9-2-1 for component index codes.)
5. Press CONFIRM.
*1 For multiple outdoor units control system only.

Thermistor reading

This function shows the current readings of thermistors located on the water and refrigerant circuit
Thermistor Description
TH1A Zone 1 room temperature
TH1B Zone 2 room temperature
TH2 Refrigerant return temperature
THW1 Water flow temperature
THW2 Water return temperature
THW5 DHW tank water temperature
TH7 Ambient (outdoor) temperature

Summary of settings

This function shows the current installer/user entered settings.
Abbreviation Explanation
HWtemp DHW max temp
HWdrop DHW temperature drop
HWtime DHW max operation time
NO HW DHW mode restriction
HWset DHW operation mode (Normal/Eco)
Ltemp Legionella hot water temp
Lfreq Legionella operation Frequency
Lstart Legionella mode start time
Ltime Legionella max. operation time
Lkeep Duration of max (Legionella) hot
water temp
Z1 mode Operation mode
- HER (Heating room temp)
- HE (Heating flow temp)
- HCC (Heating compensation curve)
- COR (—)
- CO (Cooling flow temp)

Error history

Error history allows the service engineer to view previous Error codes, the unit
address and the date on which they occurred. Up to 16 Error codes can be stored
in the history the most recent Error event is displayed at the top of the list.
1. From the service menu select Error history
2. Press CONFIRM.
Please see chapter 10-4. for error code diagnosis and actions.
To delete an Error history item;
1. From Error history screen press F4 button (Rubbish bin icon)
2. Then press F3 button (Yes).
OCH532A
Thermistor Description
THW6 Zone 1 flow water temperature
THW7 Zone 1 return water temperature
THW8 Zone 2 flow water temperature
THW9 Zone 2 return water temperature
THWB1 Boiler flow water temperature
THWB2 Boiler return water temperature
Abbreviation Explanation
Z2 mode Operation mode
- HER (Heating room temp)
- HE (Heating flow temp)
- HCC (Heating compensation curve)
- COR (—)
- CO (Cooling flow temp)
Hroom 1 Heating target room temp
Hroom 2 Heating target room temp
Hflow 1 Heating target flow temp
Hflow 2 Heating target flow temp
Croom —
Cflow Cooling target flow temp
FSflow Freeze stat function flow temp
FSout Freeze stat function ambient temp
40