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Eberspacher Espar Hydronic S3 D5E D4E Flame and Overheat Combination sensor. Genuine Eberspacher warranted repair part Eberspacher D5E Hydronic, Eberspacher D4E Hydronic, Eberspacher B5E & B4E Hydronic Heaters Applicable heaters model list in description below. Technical support and additional products available from Butler Technik Applicable fault codes that could require replacement glow pin. P00010A (051) - Cold air ? timeout P000120 (064) - Flame sensor interruption P000121 (065) - Short circuit in flame sensor For the following Eberspacher Hydronic Heaters (24v model numbers not included).Suitable for both 12v and 24v versions. 252694050000 D4E 12V CL 252913050000 D4E 12V CL 252652050000 D5E 12V CL 252912050000 D5E 12V CL 252984050000 D5E 12V CI-Bus 252922050000 D4E 12V CL 252921050000 D5E 12V CL 201963050000 B4E 12V CL 201994050000 B4E 12V CL 202049050000 B4E 12V CL 201952050000 B5E 12V CL 201993050000 B5E 12V CL 202048050000 B5E 12V CL