Installation and Operations Manual
Troubleshooting
The following table shows a number of situations that may occur on the various models.
The most frequent causes and corresponding checks are described:
3.Controllers
Problem | Cause | Checks |
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the compressor does not start (signalled by | • compressor delay set defrost post | parameters c0, c1 and c2 and dd | ||
the compressor LED flashing) | • dripping in progress |
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the temperature is over the set limits but | alarm delay set | parameters Ad, c6, d8 |
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there is no alarm message and the buzzer, if |
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fitted, does not sound |
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alarm IA is signalled (multifunction input) | the multifunction input generates an alarm | connection of the input and whether this is | ||
without actually being active | when the contact opens | closed in normal operation |
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the alarm connected to the multifunction | alarm delay set or parameter programming | 1. if A4=1 |
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input is not detected | error | 2. the status of digital input A7 |
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the defrost is not activated | defrost duration too short (dP) | parameters dP and dI |
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| interval between defrosts dI=0: in this case |
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| the defrost is not activated |
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| the end defrost temperature is too low or | parameters dt and d/ (defrost probe) | ||
| the evaporator temperature is too high |
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the manual defrost is not activated and the | compressor protection times set | parameter d9 (select d9=1) |
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defrost LED flashes |
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the high temperature alarm is shown after a | the alarm delay after defrost is too short or | parameters d8 and AH |
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defrost | the alarm threshold is too low |
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the display remains frozen even after the | the ambient temperature has not yet | wait or reduce d8 |
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defrost | reached the set point or alternatively the |
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| time d8 has not elapsed |
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after modifying a parameter the controller | the instrument has not updated the old | turn the instrument off | and | on again or |
continues working with the old values | value or alternatively the parameter setting | alternatively reprogram | the | parameters |
| procedure has not been ended correctly by | correctly |
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| pressing the SET button for 3 s |
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the evaporator fan does not start 1. | 1. a compressor and fan start delay has been | 1. parameter c0 |
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| set |
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| 2. if F0=1 (fan managed by fan controller) | 2. parameters F0, F1, Fd, dd and d/ | ||
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| • the evaporator is “hot”: the evaporator |
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| temperature can be read by selecting |
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| parameter /d; |
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| • dripping in progress; |
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| • F1 (evaporator fan control set point) too |
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| low. |
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| 3. if F0=0 | 3. parameters F0, F2, dd and Fd |
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| • F2=1 and the compressor is off |
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| • dripping in progress |
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