Frost Protection but no status

[pihome-shc]

i have very strange from this system, i was under the impression if i put frost protection to 0 then system will never go to frost protection mode
boiler.php output

2020-11-01 20:18:26 - Zone: Sensor Reading
2020-11-01 20:18:26 - Zone: Weather Factor     0.5
2020-11-01 20:18:26 - Zone: DeadBand           0.5
2020-11-01 20:18:26 - Zone: Cut In Temperature        -0.5
2020-11-01 20:18:26 - Zone: Cut Out Temperature       0
2020-11-01 20:18:26 - Zone: Mode       21
2020-11-01 20:18:26 - Zone ID: 47
2020-11-01 20:18:26 - Zone: Landing Controller: 103 Controller Child: 1 Zone Status: 1
2020-11-01 20:18:26 - Zone: Landing Start Cause: Frost Protection - Target C:0 Zone C:

no status for frost protection icon

[sandreialexandru]

Based on this issue, the system has no frost protection off mode. It is ilogic to get frost protection at 0° C. At that temperature, the water is already frozen.

[pihome-shc]

Zero temperature logic was to give user option to disable frost protection but looks like deadband and weather factor makes value -

…

On 2 Nov 2020, at 11:03, sandreialexandru ***@***.***> wrote: Based on this issue, the system has no frost protection off mode. It is ilogic to get frost protection at 0° C. At that temperature, the water is already frozen. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or unsubscribe.

[dvdcut]

some times i run into same issue but for me workaround to this is to check last temperature reporting time.

[pihome-shc]

i think fix is easy, change line 551 in boiler.php
from
if ($zone_c < $frost_c-$zone_sp_deadband){
to
if (($zone_c < $frost_c-$zone_sp_deadband) AND ($frost_c!=0)) {

[dvdcut]

i think this should work. the en.php already have information about 0 setting,

[dvdcut]

this one is moved to maxair as well, i suggest to commit one line change to old version. (1.77)
pihome-shc/PiHomeHVAC#44