Zehnder Rittling ComfoAir Q, Installer Manual

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44 - EN EN - 45
9.15 What to do in the event of a malfunction (or problem) without a malfunction alert
(troubleshooting)
Problem: The display and fans of the unit are off.
Question Answer Action
1 Is the mains power connected? Yes 1. Open the semi-transparent visor.
2. Pull the cable tray cover forwards.
3. Go to the next question.
No Connect the mains power.
2 Is the power cable connected?
(Check unit side and wall side) Yes 1. Access the control PCB as instructed in the chapter “How to gain access to
the control PCB”.
2. Go to the next question.
No Connect the power cable.
3 Is a power signal present (230VAC) on
the control PCB? Yes 1. Get the control PCB service set.
2. Replace the control PCB as instructed in its supplied manual.
No Replace the power cable.
Problem: The supply temperature is high in the summer.
Question Answer Action
1 Is the modulating by-pass function set
to DISABLE?9 Yes Set the modulating by-pass function to AUTO or OPEN.9
No Go to the next question.
2 Is the unit in heating season?10 Yes Set the limit RMOT (average outside temperature over 5 days) heat to the correct
value.10
No Decrease the temperature profile.11
Problem: The supply temperature is low in the winter.
Question Answer Action
1 Is the modulating by-pass function set
to OPEN?9 Yes Set the modulating by-pass function to AUTO or DISABLE.9
No Go to the next question.
2 Is the unit in cooling season?10 Yes Set the limit RMOT (average outside temperature over 5 days) cool to the correct
value.10
No Increase the temperature profile.11
Problem: The unit will not turn on
Question Answer Action
1 Is the power supply of the unit
connected? Yes Go to the next question.
No Connect the power supply of the unit
2 Is something wrong with the power
cable? Yes Replace the cable.
No Go to the next question.
3 Is the power in the fuse box turned on? Yes Go to the next question.
No Turn the power in the fuse box on.
4 Do you have power in the rest of the
dwelling? Yes 1. If the unit is a ComfoAir Q 350 get a F5010 fuse. Otherwise get a F5015 fuse.
2. Access the main power fuse as instructed in the chapter “How to gain access
to the main power fuse of the unit”.
3. Replace the main power fuse of the unit.
No Call your power supplier to report a power out.
9 You can find the modulating by-pass settings in menu
> MENU > TASK MENU > BYPASS
10 You can find the current season and the RMOT heat settings in menu
> MENU > STATUS > SEASON DETECTION > SEASON
11 You can find the temperature profile setting in menu
> MENU > TASK MENU > TEMPERATURE PROFILE