Immergas Victrix Zeus 25 enters summer mode

[flexmatics]

Hi,

I've previously reported support for this boiler. It worked fine for a while, but now noticed that boiler enters summer mode without any changes to settings. Restart boilder/controller didn't help - only disconnect of controller helps.

What can I try to understand where the issue is?

[Laxilef]

Hi,

What do you mean by summer mode? What is the boiler's behavior?

[flexmatics]

This is the behavior of boiler when controller is turned on (see video). Perhaps some logs would help to understand what is happening? The strange thing is that this started happening out of the blue without changing anything in settings/setup.

trim.11E02BE0-0B26-46E7-9D35-24905A2A691B.MOV

[Laxilef]

1. Try turning on the "Summer/Winter mode" option.
2. Does the boiler react when the summer mode button is pressed?

[flexmatics]

1. Tried this with on and off - no changes.
2. No, no reaction neither with short press, nor long press.

Perhaps telnet log suggests anything?

[00:01:57][OT][WARN] Failed receive exhaust temp
[00:01:58][OT][NOTICE] Received boiler status. Heating: 0; DHW: 0; flame: 0; fault: 0; diag: 0
[00:01:59][OT][DHW][NOTICE] Received temp: 54.30
[00:01:59][OT][DHW][WARN] Failed receive flow rate
[00:01:59][OT][HEATING][NOTICE] Received temp: 44.60
[00:01:59][OT][HEATING][NOTICE] Received return temp: 47.50
[00:02:00][OT][WARN] Failed receive exhaust temp
[00:02:01][OT][NOTICE] Received boiler status. Heating: 0; DHW: 0; flame: 0; fault: 0; diag: 0
[00:02:01][OT][DHW][NOTICE] Received temp: 54.30
[00:02:01][OT][DHW][WARN] Failed receive flow rate
[00:02:01][OT][HEATING][NOTICE] Received temp: 44.60
[00:02:02][OT][HEATING][NOTICE] Received return temp: 47.50
[00:02:02][OT][WARN] Failed receive exhaust temp
[00:02:03][OT][NOTICE] Received boiler status. Heating: 0; DHW: 0; flame: 0; fault: 0; diag: 0
[00:02:03][OT][NOTICE] Received min modulation: 0%, max power: 0 kW
[00:02:03][OT][NOTICE] Set max modulation: 100%
[00:02:03][OT][DHW][NOTICE] Received min temp: 10, max temp: 60
[00:02:04][OT][HEATING][NOTICE] Received min temp: 20, max temp: 85
[00:02:04][OT][WARN] Failed receive pressure
[00:02:04][OT][DHW][NOTICE] Received temp: 54.30
[00:02:04][OT][DHW][WARN] Failed receive flow rate
[00:02:05][OT][HEATING][NOTICE] Received temp: 44.50

EDIT: DHW seems to be still working fine. see log below with hot water running

[00:03:53][OT][DHW][WARN] Failed receive flow rate
[00:03:53][OT][HEATING][NOTICE] Received temp: 66.10
[00:03:53][OT][HEATING][NOTICE] Received return temp: 52.89
[00:03:53][OT][WARN] Failed receive exhaust temp
[00:03:55][OT][NOTICE] Received boiler status. Heating: 0; DHW: 1; flame: 1; fault: 0; diag: 0
[00:03:55][OT][NOTICE] Received modulation level: 100.00%, power: 0.00 of 0.00 kW (min: 0.00 kW)
[00:03:55][OT][DHW][NOTICE] Received temp: 42.60
[00:03:55][OT][DHW][WARN] Failed receive flow rate
[00:03:56][OT][HEATING][NOTICE] Received temp: 66.70
[00:03:56][OT][HEATING][NOTICE] Received return temp: 55.30
[00:03:56][OT][WARN] Failed receive exhaust temp
[00:03:57][OT][NOTICE] Received boiler status. Heating: 0; DHW: 1; flame: 1; fault: 0; diag: 0
[00:03:57][OT][NOTICE] Received modulation level: 100.00%, power: 0.00 of 0.00 kW (min: 0.00 kW)
[00:03:57][OT][DHW][NOTICE] Received temp: 42.40
[00:03:58][OT][DHW][WARN] Failed receive flow rate
[00:03:58][OT][HEATING][NOTICE] Received temp: 67.80

EDIT2: I have disabled Equitherm, rebooted the boiler and it now seems working again. Looks like something was stuck for some reason (and previous reboots of boiler/controller did not help)

[00:06:49][OT][NOTICE] Received boiler status. Heating: 1; DHW: 0; flame: 1; fault: 0; diag: 0
[00:06:49][OT][NOTICE] Received modulation level: 22.00%, power: 0.00 of 0.00 kW (min: 0.00 kW)
[00:06:50][OT][DHW][NOTICE] Received temp: 55.40
[00:06:50][OT][DHW][WARN] Failed receive flow rate
[00:06:50][OT][HEATING][NOTICE] Received temp: 36.70
[00:06:51][OT][HEATING][NOTICE] Received return temp: 28.80
[00:06:51][OT][WARN] Failed receive exhaust temp
[00:06:52][OT][NOTICE] Received boiler status. Heating: 1; DHW: 0; flame: 1; fault: 0; diag: 0
[00:06:52][OT][NOTICE] Received modulation level: 18.00%, power: 0.00 of 0.00 kW (min: 0.00 kW)
[00:06:52][OT][DHW][NOTICE] Received temp: 55.40
[00:06:53][OT][DHW][WARN] Failed receive flow rate
[00:06:53][OT][HEATING][NOTICE] Received temp: 36.10
[00:06:53][OT][HEATING][NOTICE] Received return temp: 28.70

[Laxilef]

Hysteresis turns off the heating and this is normal.
Perhaps the boiler interprets the heating being turned off as summer mode. But when the indoor temperature is below the target, the heating should turn on.

What happens if you set the target temperature 2 degrees higher than the indoor temperature? (with equitherm on)

[flexmatics]

Thanks. I've tested your assumption and it is exactly what happens. If temperature above target, heating is turned back on.

Is there any setting to fall back to some lower temperature target instead of turning off completely (i.e. summer mode)?

[Laxilef]

Is there any setting to fall back to some lower temperature target instead of turning off completely (i.e. summer mode)?

No, that's a bad idea.
On many boilers, 40 degrees is the minimum possible heating temperature. In summer, the boiler will heat the heat carrier up to 40 degrees, which is not necessary.