Boiler model

Keston Keston Heat 2 55 Fault Codes

Name: Aza & Sons Services
Telephone: +447955014805

Verified fault-code information for the Heat 2 range.

Boiler repair help from Aza & Sons Services

Fault-code index

1 — Heat 2
Flow thermistor open circuit (blocking).
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10 — Heat 2
Water-pressure sensor defect.
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11 — Heat 2
Flow thermistor open circuit; lockout after 24 hours.
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12 — Heat 2
Flow thermistor short circuit; lockout after 24 hours.
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13 — Heat 2
Return thermistor open circuit; lockout after 24 hours.
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14 — Heat 2
Return thermistor short circuit; lockout after 24 hours.
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19 — Heat 2
Heat thermistor open circuit (blocking).
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2 — Heat 2
Flow thermistor short circuit (blocking).
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20 — Heat 2
Heat thermistor short circuit (blocking).
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3 — Heat 2
Return thermistor open circuit (blocking).
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30 — Heat 2
Blocking due to return overheat.
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31 — Heat 2
Blocking due to flue overheat.
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38 — Heat 2
Blocking delta-temperature supervision fault between flow and return.
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39 — Heat 2
Lockout due to flow overheat.
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40 — Heat 2
Lockout due to return overheat.
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42 — Heat 2
Blocking due to heat-exchanger overheat.
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50 — Heat 2
Blocking due to no central-heating water flow.
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51 — Heat 2
Low water pressure.
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52 — Heat 2
No flame signal at start; restart condition.
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53 — Heat 2
Flame loss during operation, with endless restarts activated.
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54 — Heat 2
Flame loss during operation, progressing to lockout after restart attempts are used.
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57 — Heat 2
False flame with a heat demand.
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59 — Heat 2
Fan-speed standstill check fault.
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60 — Heat 2
Fan speed not achieved, for example during pre-purge or post-purge.
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61 — Heat 2
Fan-speed error during pre-purge; repeated restarts can lead to lockout.
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62 — Heat 2
Fan-speed minimum/maximum supervision error during operation; restart condition.
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63 — Heat 2
Warning due to mains overvoltage.
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64 — Heat 2
Blocking due to mains undervoltage.
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65 — Heat 2
OpenTherm Plus communication error.
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66 — Heat 2
Too many remote resets.
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71 — Heat 2
PWM pump dry-run error (80% feedback).
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75 — Heat 2
Air-pressure-switch error.
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80 — Heat 2
Quartz-crystal error.
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99 — Heat 2
System lockout caused by an internal lockout error.
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