Posted January 15, 20232 yr Good day. Not sure if I posted this previously in the correct section, so here goes..... I purchased a Sonoff THR320D to control my geyser fitted with a Geyserwise PTC Stainless Steel 230V Electrical Geyser Element 1.5kw. I previously used a geyserwise to control the element, but the time was always a few minutes off and eventually the pc board developed a problem, hence the Sonoff THR320D. My timer is set as follows. 03:30-05:30 Monday to Friday If temp <50c switch on and if temp >55c switch off 10:00-15:30 Monday to Sunday If temp <60c switch on and if temp >65c switch off It is very important that these temps and times work as they should to sync with my schedule as I'm using solar during the day and batteries at night. This is where the problem starts. Monday to Friday the geyser switches on at 03:30 and does not switch off when it reaches said 55c. or at 05:30. I have to manually switch it off. Sometimes I catch it just in time before it reaches 75c. I presume if I don't switch it off, it will just keep on heating until something pops. The 10:00-15:30 timer works perfectly. Here's the hardware/software versions etc.... Manufacturer: Sonoff Model: THR320D FW Name: SN-ESP320D0-THR3-01 Current version: 1.1.0
January 15, 20232 yr I wouldn't trust it as the only way to manage my geyser temperature. Would have a regular SABS thermostat set to 70c as a fail safe, just in case. Worst case it heats to 70c and the thermostat switches it off before it goes psssshhhhhhhhhhtttttttttttt!!!
January 15, 20232 yr From time to time my sonoffs also did not behave, and sometimes I could not control them locally even though they showed online and was registered for local lan control. One even showed offline but I was able to control it locally. Sometimes I found that they are all offline. My problems went away when I flashed them all with tasmota. I believe you can also build Rules into into tasmota (as fail-save) to switch off when the temp is over 55. Edited January 15, 20232 yr by iiznh
January 16, 20232 yr On 2023/01/15 at 4:45 PM, Warlok said: Good day. Not sure if I posted this previously in the correct section, so here goes..... I purchased a Sonoff THR320D to control my geyser fitted with a Geyserwise PTC Stainless Steel 230V Electrical Geyser Element 1.5kw. I previously used a geyserwise to control the element, but the time was always a few minutes off and eventually the pc board developed a problem, hence the Sonoff THR320D. My timer is set as follows. 03:30-05:30 Monday to Friday If temp <50c switch on and if temp >55c switch off 10:00-15:30 Monday to Sunday If temp <60c switch on and if temp >65c switch off It is very important that these temps and times work as they should to sync with my schedule as I'm using solar during the day and batteries at night. This is where the problem starts. Monday to Friday the geyser switches on at 03:30 and does not switch off when it reaches said 55c. or at 05:30. I have to manually switch it off. Sometimes I catch it just in time before it reaches 75c. I presume if I don't switch it off, it will just keep on heating until something pops. The 10:00-15:30 timer works perfectly. Here's the hardware/software versions etc.... Manufacturer: Sonoff Model: THR320D FW Name: SN-ESP320D0-THR3-01 Current version: 1.1.0 Hi I complete agree with scoobs, never remove or bypass the thermostat that is there. Does your system show that the temperature on the sonoff is higher than 56C on the screen or app? Also please enable notifications while in the debug phase it will make it easier to find what is causing the problem. Please post some screen shots of the configuration and I will gladly see if I can see anything that could be causing the issue. Aleks
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