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Tap water would start hot for a few seconds then would run barely warm. Radiators had been coming on unwanted. We found that the boiler was also firing when no external demand was present at all and the display showed "d" suggesting that domestic hot water was being supplied.
We removed the actuator from the diverter valve and found that there was very little travel on the push rod of the diverter valve, only about 2mm. We suspected the diverter might be faulty but also suspected the circuit board as the boiler fired with no external demand. We had checked the incoming electrical supply to the boiler and found 230V ac between L3 (permanent live) and Neutral but no voltage between L2 (switched live) and Neutral.
We rang Ideal Tech Services and asked what push rod travel we should expect on the diverter valve but they didn't know. They said they needed to know what the display showed while the boiler was running without being called for. Since it showed a domestic hot water demand "d" they asked us to turn off the cold mains water inlet valve to ensure that no hot water was being supplied. This made no difference and the boiler continued to fire. Ideal Tech Services said this implicated the diverter valve.
We changed the diverter valve assembly which was simple after relieving the heating system pressure (4 Allen bolts with easy access). The boiler worked normally with the new diverter; tap water at the correct temperature and no radiators hot without a heating demand.
For reference, this was the WILO waterset diverter valve and the travel on the push rod is about 10mm. We don't know the normal travel on the CP waterset push rod but suspect it will be similar. If we find it we'll publish it here.
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Ideal Isar HE24 Gas Combination Boiler Faults, Problems and Fault-finding
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We have also started to put together a guide to shower types, gravity showers and power showers. You can find it at powershowerguide.com
And in his spare time Paul is working on a web site about Lake Garda in Italy, particularly Limone sul Garda, Riva del Garda, Malcesine, Lazise, Bardolino and the town of Garda itself. He's hoping to earn money by carrying advertising on the site from hotels and tour operators, travel companies and other companies linked to the hotel, travel, leisure and tourism sector. The site is PictureLakeGarda.com
It’s possible that fault-finding may not sort out your problems or that the repair costs mean you should consider having your Ideal boiler replaced. For a replacement boiler or a new boiler installation we would recommend Worcester Bosch. Given current regulations and the work involved, boiler replacement is never cheap but sometimes a new boiler installation is the best option.
Why are Worcester Bosch our first choice for boiler replacement?
Worcester boilers are well made and the quality seems consistently high. Their technical backup is very good. The warranties on Worcester boilers are good and we’ve found that Worcester spares are readily when needed. We hardly ever have to wait long for spares.