'Idling' means the water pump keeps operating but the burner is OFF. The unit was working perfectly as per the technical manual - idling once the water reached 76.5degC and resuming half power once the temperature drops to 71degC. I thought this might be an error so plugged my Webasto into a laptop running the Webasto diagnostic software (c/o a friendly local Webasto dealer).
If I turn down the rads on their thermostatic valves so more heat goes into the calorifier, the Webasto goes into its 'idle' mode on a 50% basis - ie: 3 minutes ON and 3 minutes idling, because the calorifier alone cannot absorb 2.5KW of heat input from the Webasto's half power mode. 1533 or 1530 digital timer 25 Telestart T91 / T100 HTM Telestart Pushbutton. From start-up, in the morning, my unit runs on full power for about 25 minutes (5KW) and then cuts down to half power for the rest of its ON time.ĪLWAYS carefully follow Webasto installation and repair instructions and heed. The maths confirms this - it needs about 3 hours starting with cold water. Whilst one hour is definitely more than sufficient to get the boat toasty warm, it isn't sufficient to heat the calorifier to 'shower heat' if the water is at ambient. I have 2 standard rads, 1 bathroom towel rail and a 60 litre calorifier. I have modified mine and the mod works perfectly. He was the one that let me into the 'secret'. I had a conversation with one of Webasto's technical guys to whom I had complained that 3 different instruction sets that came with the unit claimed that it would switch off automatically after 30 minutes, 60 minutes or not at all!! This also works the other way round, viz: if you open the switch to obtain one hour's use of the Webasto but change your mind later, closing the switch will cause the Webasto to revert to continuous operation until manually cancelled. Note that if the Webasto is started in normal mode and this switch later switched to open, the Webasto will continue for one more hour and switch itself OFF. However, if the switch is open (ie: OFF) the Webasto will perform as normal BUT will switch itself OFF automatically after one hour.
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